[XT1550] Frequent bootloop and can't get past bootloader

[issafrog]

For the past couple of days, my device has been shutting down by itself and it often doesn't boot when unplugged (if it does, it is stuck in M screen bootloop). When I do plug it in, following things tend to happen:
- Stuck in bootloop with M logo screen
- Boots till "unlocked bootloader warning" screen pops up and then reboots again
- When I get in bootloader screen, I can't get past it. Can't even access recovery mode sometimes and if I do the device randomly shuts down
This feels quite random as it happens about 7 out of 10 times when I'm trying to reboot, eventually it ends up in the bootloop regardless of what I try.

My older rom was Lineage OS 14 that I flashed with TWRP. Today, somehow I managed to get into recovery mode for quite some time so I wiped the data and clean flashed superSU. The phone worked alright until I started setting up my device with accounts and all that stuff, it shut itself down again.

I had been using the rooted phone with Lineage OS for over 8 months and it was working just fine, no issues at all. The only new app that I installed recently was Blokada and the next day this started to happen. I don't really suspect Blokada, but still I don't know what is happening. It is hard to do anything because I can't access device storage on my PC when I'm just in the bootloader screen.

Can anyone please help me out with this? I will REALLY appreciate it if someone can help me solve this. Thank you in advance!

 

[R1ffR4ff]

Could it be a fault with the Battery or it's internal connections?

 

[pantxus]

I've got similar problems. It's the battery, read your charge amount.
Today my cell fell and shut off, then reboot with M logo. Then 6% of battery, after a couple of hours I beat the phone, turn it on, an then 81% (a more realistic percentaje)

---------- Post added at 08:31 PM ---------- Previous post was at 08:30 PM ----------

I've got similar problems. It's the battery, read your charge amount.
Today my cell fell and shut off, then reboot with M logo. Then 6% of battery, after a couple of hours I beat the phone, turn it on, an then 81% (a more realistic percentaje)