[Galaxy Tab 2 Q&A, Help & Troubleshooting] billysam:
So you haven't flashed anything or tried to root. so you're clean in that manner. But Aptoide seems to be the culprit here.

"Aptoide Anti-Malware platform analyses applications in run-time and disables potential threats across all stores."

So, basically aptoide allows pirated apps, they could even give you access to the malware and viruses and not even let you know about it. So, even if you're installing a safe app like a game which is also available on the google play store(which is the safest place until now) malicious codes could be added to them over aptoide.

---------- Post added at 10:51 PM ---------- Previous post was at 10:38 PM ----------

What a factory reset does?

It removes all USER DATA and restores the device back to factory settings providing that the device is not rooted. User data is defined as apps, call logs, contacts, and anything else the user has placed in the devices memory. Stuff that is on the SDCARD is not affected by a factory reset. A factory reset really only deals with the Data and the Cache partitions.

So, if your system is modified and you're not on a custom recovery(you get through flashing with odin). it will only delete data and cache, system apps will stay as it is. i.e system files modified in your case.

Unknown sources box doesn't help much either and verifying non-google app won't work since aptoide has already the permissions to allow.(that is how you could even get a pirated app installed through aptoide in the first place. makes sense? then the malicious apps also gets way in and use scripts to get into root)

---------- Post added at 11:23 PM ---------- Previous post was at 10:51 PM ----------

Yes, it's not a power saving mode, and kernel isn't modified either and no, this is not a root induced by you, but it's malicious activity, so don't stay like that.

Flashing stock firmware through odin

wipes/format system,

boot/kernel,

cache,

hidden partitions and rewrites them all like it came out of the box(except data on your external memory card.) It will leave no sign of any apps or hidden codes or any data that doesn't belongs to Samsung. So no root, completely the way you bought it the first time. no need of xda anymore and you can stay without it even making update possible to work. but then you're not getting any more updates from them. but xda here on xda have so much updates if you've seen already.

---------- Post added at 11:55 PM ---------- Previous post was at 11:23 PM ----------

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the reason the app stops, could be because bad, overwritten, conflicting data, or even in case when you're ram is pretty much choked up all apps could start misbehaving and stop responding.

simple test, try deleting system update app's data. in settings- app manager- all apps. if it's because bad data, it will sort things out.

any app under settings-app manager you find that has uninstall option ------ is not a system app.

the apps which you can only disable and can't uninstall ------- are the apps installed on your system partition.

So, don't be confused, focus, first clear data/cache of all the apps that you suspect or is getting stopped, then uninstall the apps which you can, get rid of aptoide, Galaxy Tab2 Screensaver. use google play store or amazon and install apps from them only, or sites which you can trust. if you want to disable samsung update, disable it as well, since it will never show any update anymore and won't be getting stopped.

See how it goes, if problem persists, then we will get over to flashing through odin