Ever since the upgrade to Android 5.1 Touchdown has occassionally been prmopting for a PIN twice even though I am certain it was entered right on the first try. This happens maybe 5% of the time for me, but for one of the users that I support at our company it is happening 90% of the time.
I tried setting a new PIN myself and still had the issue occur after that. Just this morning I cleared data and resetup Touchdown, though it will be hard to verify if that worked due to the infrequency of the issue for me.
Any other ideas what might be causing this?