Yes the issue seems to be only when user is already log in - and do something else. When he come back (can tell after how many minutes / hours) gun is freeze. Only with the Windows Mobile / MC-9190 - this issue is not there on the MC-9090 / Windows CE (still using Wavelink)
The RF gun sleep mode is 30 minutes (maximum) and on SAP side i set the value to keep alive the sessions 4 hours
Thanks