That's a common issue with all Game Boy Pockets. You need to use fresh alkaline batteries (not NiMh) and the problem should go away (for a few hours). The problem is that the batteries in MGB consoles cannot keep up.
There are no games yet. The test file is linked above in Smelly-Ghost's post. The ROM works on actual hardware (MBC30 based flash cart with MBM29F033C "ROM" chip) but so far not on any flash carts. I've only tested carts with RTC since an equivalent MBC5 ROM should work fine. Everdrive X7 also...
My mistake, apparently, was mentioning that Crystal Clear worked fine. Polished Crystal seems to work as well. Not sure when Kernel 1.03 and Firmware 3.0 came out (the 11th?) but I just updated my JR and tried it again and it's still doing to the same thing.
Not too big of a deal since I have...
I did already report this bug to Prism devs on their discord about two weeks ago. They seemed to dismiss me even though someone else chimed in with the same report.
Pepsi, and it's companies, did not pull out of Russia like most did, even tho they orig said they would, so I boycott them. (Except when drunk at 2am and Taco bell is only place open.)