Same issue with my ibasso DX50.
I'm traveling, my DAP is Onkyo X1, both output sockets failed, and I sent the X1 to Romi Audio in Hong Kong for socket replacement.
Found my 3 year old DX50 in my backpack, I had forgotten about it, not used for years. It felt so good! I have a DAP again!
Updated yesterday to 1.9, deleted the firware file, and did Factory Reset. Now the ibasso DX50 is randomly restarting in every 3 minutes into the song. Sometimes 3.20min, sometimes 3.30min, but it restarts every time during playing 1st song after powering on. As it is now, my ibasso DX50 is useless, and it is firmware issue, if it was player itself, the hardware, it wouldn't play, wouldn't turn on etc. But it does turn on, plays a FLAC, and then restarts for no reason.
I removed battery, pins seem fine, battery is fully charged, battry indicator also showing battery full. Yet the DX50 keeps restarting, can't even listen 1 song from start to finish.
I'm out of ideas, this is old thread and most people here have surely moved on from DX50. In 2016 there were several posters in this thread, describing the very same issue with their DX50.
Is there a solution, or should I go and buy a new DAP? Onkyo repair will take only 1 week, usually quicker, said Romi Audio, the issue is shipping time, I'm without a DAP at least 4 weeks. That means I will buy a new DAP tomorrow, unless ibasso DX50 can be resurrected.