Hello! I know what it maybe dublicate, but not find on forum this.
If sometimes a320 freeze or you see something like i/o errors on console and after reboot filesystem on sd is corrupted (linux not load) - check filesystem and wrap sd card or adapter with tape in one layer.
Why it can help? I see 2 dingoo what have one problem - cart not good enter to slot. It you accidental touch card (but with no eject) it can looze contact.
P.S. sorry - my english not well