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I recently updated to android 2.3.4 (BUILD: DDKQ5 ) and that fixed this problem !
its been over 24hours on wi-fi and no freeze/switch-off
--Harsh

Hi, I just have a question, where did you find it?
Hi, I just have a question, where did you find it?
Thanks.
Wifi Configuration "NEVER WHEN PLUGGED IN" works for almost 48hrs as far as I can notice.
Android Version 2.3.4
Kernel 2.6.35.7
Build XXKPH
Just got my galaxy ace yesterday and the SOD occurred numerous times in last two days. Had wifi on constantly. Just tried the *#*#526#*#* code and will update if SOD reoccurs or after a week if it doesnt.
Hi there,
I'm a noobie and this is my first android phone.
Like many Ace owners, my phone suffers from the SoD syndrome. I read in several forums that it could have something to do with the wi-fi being on for too long. So, I changed my settings to wifi "Never" sleep, did a factory reset, installed Android Booster apps and what not... Nothing has helped.
Last nite I did not have my wi-fi on at all and in the midddle of the night I noticed that the phone was dead again...
My biggest fear is that the alarm clock won't go off in the morning when I have to work nect next day. Anybody an idea if the alarm will still work, even though the phones goes into SoD mode???
Thanks for your help!!!
One thing you can have sure of... the alarm WON'T GO OFF if SoD occurs.
Already happened to me!
But, however, since I've made the Kies update to 2.3.3, i've never had another SoD. Also it solved the problem with bluetooth sync with my car.
The most relevant drawback of this update is that the battery drains faster.
Thanks Hugo_B for the information. It's very scary that the alarm won't go off when the phone goes into SoD...
Did you do an official firmware upgrade via Kies? Or how did you get your GB update?
I heard mixed reviews about solving the SoD problem by upgrading the OS. Some people say it got worse after the upgrade, some say it went away. I still have mixed feelings about upgrading, as I hope that Samsung will work on the bugs that GB still has, before I upgrade...
One thing you can have sure of... the alarm WON'T GO OFF if SoD occurs.
Already happened to me!
But, however, since I've made the Kies update to 2.3.3, i've never had another SoD. Also it solved the problem with bluetooth sync with my car.
The most relevant drawback of this update is that the battery drains faster.
Interesting that you say the battery drains faster - I understood from numerous other forums that Gingerbread actually extended battery life.
Also, the problem of sticking in standby is a hardware one and not fixed by software. IT may be Gingerbread automatically switches off WiFi in standby which works around the problem?
In any case, I have resigned myself to simply switching off WiFi after every use and since starting this many months ago, I have not had a recurrence.
This was the case on 2.2 and no change since updating to 2.3 a few days ago.
Interesting that you say the battery drains faster - I understood from numerous other forums that Gingerbread actually extended battery life.
Also, the problem of sticking in standby is a hardware one and not fixed by software. IT may be Gingerbread automatically switches off WiFi in standby which works around the problem?
In any case, I have resigned myself to simply switching off WiFi after every use and since starting this many months ago, I have not had a recurrence.
This was the case on 2.2 and no change since updating to 2.3 a few days ago (not that I have tried to see if the fault still exists since upgrading).
Interesting fact, that some of you guys seem to have solved the SoD problem with the GB update.
I'm trying to find/see a pattern in here and therefore wondering where you did your GB upgrade? Was it the official one via Kies, or from other unofficial sources?
Since I'm not very good at those technical stuffs, I need to ensure that I upgrade from a source that does not cause me more headache than the current Froyo version. I wouldn't wanna have to find a way to downgrade the OS again after an unsuccessful upgrade.
TIA!
Yesterday I was listening to music while I was going to school, and I was happy, because I didn't have SoD. 
Hi!
I have a Galaxy Ace too, and my phone suffers from SoD... When I'm at home, i always leave wifi turned ON and there is no SoD. Sometimes I forget to switch the wifi off in the morning(before I go to school), and everytime I enter my school, my phone falls asleep(SoD). Sometimes it has SoD in different places in different times, while I'm walking in the centre, etc. But at home I have never had it... I have Gingerbread KPK firmware updated via Kies. My phone is rooted, and I have Juice Defender and Battery Indicator. At wifi settings I set sleep policy to never. As I remember, when I had Froyo, it happend 2-3 times in a week, then I updated to Gingerbread(KPK), formatted my SD card(8GB) and did a hard/factory reset. It maybe solved the SoD problem. I don't know that for 100 percent because in that time I didn't have to go to school. Maybe after I installed Juice Defender, my phone started having SoD again... I'll try that if I go to school with Juice Defender disabled, I hope I'll be luckyYesterday I was listening to music while I was going to school, and I was happy, because I didn't have SoD.
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today i'll just do a hard reset and I'll format my sd card. I hope it'll have some effect.. 