I can never submit an answer I've typed from my android mobile phone!? After typing the submit button disappears...every time this happens...I end up losing my answer from the back and forth effort in trying to press where the submit button usually is. Frustrating!
I have that problem sometimes with my android tablet. I just leave the page open for a bit,then go back maybe five minutes later and the submit button has reappeared.
Are you using the mobile answerbank app?
Does the submit button work if you click where it should be- ie bottom right below the answer box, just after the remaining wordcount stats (eg 184/4000)