SGS4, Cyanogenmod: infinite soft reboot when internet (wifi or data) is turned on

SGS4 (GT-I9505). I installed cm-11-20141112-SNAPSHOT-M12-jflte about half a year ago, never had any (major) problems.

Then I woke up (late, because no alarm) this morning, noticed my phone was turned off. I tried turned it on and as soon as I entered the PIN it rebooted. After sometesting I found out that when wifi or data is turned on (either by turning one of them on manually or by exiting flight mode), the second I have connection (I do receive some whatsapp messages) my phone does a soft reboot.

The only thing that has changed (as far as I know) in the past couple of days: I installed Nova Battery Tester through Aptoide (downloaded here since it's no longer in the play store). I ran 3 online virus tests on the apk and limited its permissions with xprivacy, so I hope I'm safe in that regard. Plus, it was installed 3 days ago. Still, you never know. I uninstalled the apps (both Aptoide and NBT), but still get reboots.

Apparently people have similar problems with wifi-only, but the solution is usually: reset or reinstall the OS. Not really a solution, though I'm probably going to do that as well, since I don't foresee a solution soon (as in: today).

Anyway, if anyone does know of a solution -if not for me, then maybe for the next person- (or maybe can tell me to not use Nova Battery Tester), please share :)

RIP my SGS4?

HELP.. RIP my SGS4?
Okay so I have been researching for the last week for solutions..in fact i have not found the exact same problem I have..
Samsung Galaxy S4 White 16gb Rogers
Running Lollipop that was pushed by rogers
Not rooted, nothing custom
Battery works fine on other S4's, new battery didn't help my phone
Problem: Every time i turn it on, it shows the "SAMSUNG GALAXY S4" for about a second or two and then turns off and wont turn on again until i take the battery out and put it back in...where it does that again, before i could drain any sparks left from the phone before putting the battery back in and it would turn on and i can use it until i touch the power button, where it would pop the prompt to turn off/restart device where then it would just turn off.. if it got a little to heated it would do the same. My friend is a phone technician and he said he cant find the problem...so I am hoping someone here can help me out. The battery will probably die soon and I cant seem to get it to charge.
I have factory reset it twice and nothing helped. I factory reset in recovery mode both times.
I hope everyone has a wonderful day and someone is able to help me out.. I kinda dont have a phone now :( Anyways, thanks.

P.S. I can upload a video to show you what I mean if you dont understand my typing lol.

sgs4 sim problem

SIM problem with i9505
I have an s4 which was on Tmobile, i upgraded in a shop to a note 3 om EE and had my number ported to the note 3, ever since the s4 will not take an EE sim card, it just says there is no sim inserted, strangely though there is signal showing but when you try to dial out it says not registered on network, i have spoken to Tmobile, EE and taken it into numerous shops, essentially they are useless and dont want to know, i dont think the SIM socket is damaged as it takes every other sim and works fine. I just flashed an EE stock firmware to it but still it doesnt seem to accept the EE sim.

I have also put root checker on the phone which is saying the unit is not rooted properly, if that is so then surely i wouldnt have been able to flash the firmware to it ?.

Not sure what steps i should take now to try to sort this out, the carrier is denying that the problem was caused by them, some have said that it is locked from the EE network, if that was so i would have no service, not an uninserted sim error.

Is there something that will unlock it if indeed it is a lock problem (which i dont think it is)

SGS4 Loudspeaker Issue

I have a samsung galaxy s4 sgh-i337 here and the loud soeaker does not work. As soon as battery is xonnexted you get a screech... The device was water damaged but after alcohol cleaning device powered on and seemed to work. Upon further inspection there was no external sound, or sim card detection. Replaced sim card reader nd now that works. For the speaker so far i have....
1. Replaced speaker
2. Replaced charge flex
3. Replaced battery
4. Checked audio settings
5. Contemplated factory data reset

Now standing pacing really thinking audio ic?? But the head phone jack works and reciever works..... Please help me out.