SM N900T freeze and app issues
Hello everyone I was wondering if you could help me with an issue I have.
I bought a t mobile galaxy note 3 from a craigslist guy, the phone seemed fine until I got to use it more. It isn't unlocked or anything, I been using ot without a sim card because I plan to put it on metro pcs.
The phone seemed fine but once I rebooted it i saw this strange commands on shutdown and also on boot, also it had some apps like devtools and samsungstringcode. Also had constant crashes on apps like chrome, internet browser and many others. I decided to flash the stock rom using odin, the boot and shutdown commands dissapeared after flash, also I didn't have those apps I mentioned, and everything seemed to work find for like 4 hours, then I rooted the phone and used region unlock app, and the issues started again, freezez followed by a reset, I see the samsung logo and then the T mobile logo, both without sound, then back on the lockscreen. After that I did another stock rom flash but the problems persisted right after the flash.
I don't know if it's a software issue or hardware please help me.
Sorry for the long post, but I'm desperate, I have no warranty at all.