Apple Watch Ultra 2 keeps restarting several times a day (Under Voltage(UVP) EVENT detected)

Hi,

My quite new (1.5 month) Apple Watch Ultra 2 keeps restarting several times a day. I believe it starts happening when battery level goes under 80% and fewer juice there is, the more restarts happen. I decided to wipe the device, to check if it's a software problem, but after that I couldn't pair device with my phone. It just kept restarting during the pairing process.

I brought my device to iSpot (polish Apple Store) to use the warranty. After couple days they gave me back my device, saying that no hardware problem has been detected and claimed they just reinstalled the system (whatever that means). After that I tried to pair the device, with no luck, but trying again I've got notice about low battery, so I took watch home, where I charged it and successfully paired.

Next day, after battery level went below 80% it started rebooting. At first it was every hour or two. Then frequency increased. I've got also really weird issues with the screen that didn't want to turn on, but device could be found by find my application and even played sound. I managed to download some logs, that look like something with power is a problem here

{"roots_installed":0,"os_version":"Watch OS 11.1 (22R585)","incident_id":"4E106208-2155-488A-804B-61FD42B95B6A","timestamp":"2024-11-19 23:03:11.00 +0100","bug_type":"210"}

{

"codeSigningMonitor" : 1,

"panicString" : "panic(cpu 0 caller 0xfffffff0164d87f0): \"IOMFB ERROR: Under Voltage(UVP) EVENT detected\" @UPPipeAP_M11.cpp:683\nDebugger message: panic\nMemory ID: 0x6\nOS release type: User\nOS version: 22R585\nKernel version: Darwin Kernel Version 24.1.0: Mon Oct 7 20:39:24 PDT 2024; root:xnu-11215.44.1~1\/RELEASE_ARM64_T8310

What can be the cause of this? How to convince Apple, to really take a look into my watch?