Help Your internet connection is unstable + Cache issue

[PaperPhantom]

Hello.

I've had this phone for a few months now, since early Februrary, and this is a problem that I've been dealing with since day one. It was a lot less annoying back then than it is now, so I never sought any help. Now, however, it's getting to the point that I can't watch a single 20-minute episode of anything on Netflix without this error coming up. The error notification itself wouldn't be an issue, but when this error comes up, it automatically cuts off my Wifi connection on my phone (note that wifi itself is still turned "on" and that my internet connection is fine, 99% of the time this pops up), and I have to turn it off and back on again to be connected to a relatively decent internet connection (Sprint's 3g is like 1x on Verizon...absolutely terrible).

I've encountered this error before, on my previous phone, a GS3, but only after an update in mid-late December of last year. I never did find a fix for this issue then, either.

I've searched around from time to time when this problem is at its most annoying point for me, and usually I'll find people advising those of us with this problem to wipe our cache partitions by booting into recovery mode. I have tried this myself, but I've never been successful as when I select "Wipe Cache," I am immediateley taken to a screen that says, simply, "Error!" and the phone promptly reboots.

So I have two questions that hopefully somebody here can help me with:

1) Is there another way to fix this Wifi issue, other than wiping the cache?
2) If not, does anybody know why I always get an error and how to bypass it the next time I try to clear my cache?

I'm not sure what information I should leave here, so I'll start with this and provide more as needed:

Model Number: SPH-L520
Android Version: 4.2.2

 

[Rukbat]

If it's a few months old it's still under warranty. Bring it back to where you bought it and ask for a warranty exchange. (Make sure you have EVERYTHING not on the external SD card backed up - you won't be getting it on the replacement phone. Google contacts will resync. So will apps, but the data for those apps, like game scores, documents, music, won't, so use something like Hydrogen to back up the apps AND the data for the apps. I'd use SMS Backup & Restore to make sure that your messages don't somehow get lost too.)

If you're keeping everything backed up regularly (which you should be - if the phone gets ridden over by a truck, there's nothing left to back up), you can ignore the part bout making a backup.