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Help S3 sudden drop in performance

Espis

Newbie
So, I'll try to make this as short as possible:

A month or two ago, my S3(4.1.2, rooted) started freezing and randomly reebooting. I did my research, and found out that my phone was suffering from SDS. This was supported by eMMC BrickBug Checker, which said I had an insane chip. So I decided to try a different ROM. That didn't fix the freezes, and I googled some more about SDS. I then figured out that if I'd let the phone unfreeze itself then everything would be alright. So I did. The phone froze, I put it down for 30 minutes, and the phone was operational again. I repeated this process for at least a month until I gave up waiting for the freezes to unfreeze. The phone constantly kept freezing at the times where I needed it the most, so the easiest and fastest way to make the phone working again was to hit the power button and reboot it myself. Additionally, I didn't see any improvement in the phone's freeze-reboot bug. If anything, the problem actually got a tad worse.

Anyway, I was getting tired of SDS, so I decided to send it to repair: I wiped the phone and flashed the stock 4.1.2 ROM via ODIN. Then I started using it again, just for fun, to see if SDS had gone away(Which I thought it would not), before I would send it back to Samsung.

And, the symptoms of SDS were gone. Since returning to stock, I have yet to experience any freezes similar to the SDS-freezes from earlier. The BrickBug Check still says that I have an insane chip, though.

Now here comes the real problem: The general performance of the phone has now dropped, significantly. It often lags, and when I am in an app(especially Facebook and Ingress) and press the home button, the phone takes about three seconds to respond, and then sends me home. When I open the app drawer, it very often needs a few seconds to display my apps, and the multitasking menu is painfully slow on launch. Very often Tasker is also killed, for no obvious reason, and I have to open Tasker to activate it again.

The really odd thing is that the benchmark score(AnTuTu) is still pretty much the same as when the phone was relatively new.

Any ideas?



Sorry for the novel, but I felt that it was necessary...
 
Man i dont know what to say tbh lol. Its a strange one. Unrooting "shouldnt" have fixed the freezing if it was SDS related. Were you usin a custom rom before flashing back to stock?
Id probably give the phone a nice factory reset and see what happens since you probably dirty-flashed stock(?) :thumbup:
 
If you've got a bad chip and were planning on sending it back in for repairs anyway, I'd go ahead and let Samsung deal with the headache.
 
Still need more info. What ROMs were you running? TW or cM based? What settings for cpu did you use?
I'd say that the reason you're seeing lag now is that the stock ROM idoesn't clock as high in processor performance tests as some custom ROMS.
 
OK, some more info for you:
The first ROM I tried was Paranoid Android (don't remember the exact version number, but I think it was from about 3.6-ish and up). I ran that ROM for about a month before I dirty flashed CM10.1(nightly, around 28.7.13 or so). It then ran very well, but the freezes kept coming.

I didn't mess around too much with clock speeds, but at the point of returning to stock, I slightly under clocked @1300MHz. I never under/overvolted.

Also, because I flashed the stock image via ODIN, I thought that would wipe the entire device? At least the guide I followed clearly stated that...

Oh and BTW, after going back to stock, I also rooted it again via ODIN, if that is of any interest.
 
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