I know this thread is old. But i have the same r4 card and when i start up my ds it completely freezes the second i turn it on. I opened it up(don't try it unless you have absolutely no other choice) and i found a damaged section on the circuitboard. I can't tell for sure or how it got there in...
I'm gonna buy another Series X, but can't decide if I should wait till the Xbox June event (maybe they get discounted) or just buy now. What do you guys think?