It seems that these devices are completely unpredictable. Some work smoothly as reported some tend to crash. I spend a lot of time with my dx200 not hearing music but doing the factory batch again and again. On the last FW my dx200 stopped working on the pure Mango and Mango android as well. Just stopped working during the playback without good reason, why!?! Went back to 2.3.125, possibly will be better on Android at least, pure Mango crashes for sure, this I know. I can accept the philosophy of not absolutely perfect product, tuned by updated FW but my device is not a product at all, it is just the prototype required further work on it, not sure if only the software is the case.
The last chance - I've installed Lurker FW. Does it help generally the software to be more stable? Or maybe Mango remains not trusty and the only solution are other Android players (like Hiby)?
No, Lurker just "fix" very few issues on every firmware version, major bugs still remain. The most I love Lurker firmware is they support Google Play which we cannot find in stock firmware. I think DX200 is the only Android DAP which does not support Google Play, same as China domestic Android mobile phone, it is a weird decision from iBasso.