[Q] Xiaomi Redmi Note random reboots /app fc topic

Hello!
I have recently bought a Xiaomi Redmi Note wcdma device
When device came he had a faulty updater so i've decided to update the firmware to the latest firm available (via recovery). Before and after the update the device had the same problems: random reboots and some app/sometimes froze the phone.
So i flashed a rom via fastboot with spflash. I had the same problems.
The curent version that i am using is Official Stable Multilanguage WCDMA MIUI v5 39.0.0
I got system freeze when i was trying to clean recent apps and when i played Shadow Fight 2.
In the last case was a softreboot that i have succesfully catched in a logcat.

Code:

---

02-07 08:11:05.660 F/libc    (  160): Fatal signal 11 (SIGSEGV) at 0x00000000 (code=1), thread 160 (surfaceflinger)
02-07 08:11:05.662 F/libc    (  160): Send stop signal to pid:160 in debugger_signal_handler
02-07 08:11:05.662 I/DEBUG  (13437): handle_request(16)
02-07 08:11:05.662 I/DEBUG  (13437): check process 160 name:surfaceflinger
02-07 08:11:05.664 I/DEBUG  (13437): BOOM: pid=160 uid=1000 gid=1000 tid=160
02-07 08:11:05.666 I/DEBUG  (13437): [OnPurpose Redunant in preset_info] pid: 160, tid: 160, name: surfaceflinger  >>>  <<<
02-07 08:11:05.780 I/DEBUG  (13437): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
02-07 08:11:05.781 I/DEBUG  (13437): Build fingerprint: 'Xiaomi/lcsh92_wet_jb9/lcsh92_wet_jb9:4.2.2/JDQ39/JHDCNBL39.0:user/release-keys'
02-07 08:11:05.781 I/DEBUG  (13437): pid: 160, tid: 160, name: surfaceflinger  >>>  <<<
02-07 08:11:05.781 I/DEBUG  (13437): signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 00000000

---

My questions are :
1. What is it to be done (i have no more ideeas)?
2. Is it safe to upload the entire logcat?