Xperia L continuously restarting even in Safe Mode - General Questions and Answers

Hi,
I am using Xperia L C2104 (Android 4.2.2) for almost 3 years.
Yesterday, I manually restarted the phone. After that it kept continuously restarting.
Even when I booted to Safe Mode, it kept continuously restarting.
After a few hours, I tried again and it started working OK in Safe Mode. I took a backup and uninstalled most of the third-party apps.
Then I tried booting into normal mode and it worked OK.
After using the phone in normal mode for few hours, it restarted on its own.
It again kept on continuously restarting. After several attempts, it started working OK in Safe Mode.
I am currently using it in Safe Mode.
I am planning to take it to Sony service center in 1-2 days.
Any idea what could be going wrong?
Do you think a built-in app (Google etc) could be causing this problem?
Do you think a Factory Reset would help?
Or, do you think it could be a hardware problem?
Thanks for your help.

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My phone is not rooted the.bootloader is locked. It's stupid that I can't access the factory menu or root a phone that I personally own.
I've reset my phone through the phone menu. The phone is now in a boot loop. The screen goes blue after 5 minutes everything and the phone restarts. Last week it happened rarely, yesterday it restarts every hour and now I have even less time before the phone restarts.
Safe mode doesn't have an effect on it either.
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Ianol said:
My phone is not rooted the.bootloader is locked. It's stupid that I can't access the factory menu or root a phone that I personally own.
I've reset my phone through the phone menu. The phone is now in a boot loop. The screen goes blue after 5 minutes everything and the phone restarts. Last week it happened rarely, yesterday it restarts every hour and now I have even less time before the phone restarts.
Safe mode doesn't have an effect on it either.
My guess is that its like a windows blue screen of death relating to memory.
Are there any options left to fix the problem?
Click to expand...
Click to collapse
Open sony companion
And select repair my phone.
same happens to my xperia m4 aqua after updating to marshmallow. any solution?

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Boot this Androd 5.1 based phone into "Safe Mode":
Safe mode can help you investigate and find problem apps if optimizing app 1 of 1 ... issue is caused by unsuitable or broken apps. You can stop Android optimizing apps by booting the device in Safe mode.
jwoegerbauer said:
Boot this Androd 5.1 based phone into "Safe Mode":
Safe mode can help you investigate and find problem apps if optimizing app 1 of 1 ... issue is caused by unsuitable or broken apps. You can stop Android optimizing apps by booting the device in Safe mode.
Click to expand...
Click to collapse
Thank you for replying! I just tried to boot it into safe mode, but it didn't work. When I saw the ZTE logo on the screen I quickly pressed volume down and held it for about one minute or longer, but the phone was still stuck at the "AXON" logo screen and started the bootloop. It wouldn't load in safe mode. I've tried a few times, but it still doesn't work.

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