i got problem on my Garmin XT after flash my kaiser to WM6.1... it run smmothly on WM6

my problem is sometimes it occur error for que.exe when i using it to navigate me.. i've try to uninstall the GXT and clear all the file on my Storage Card and fresh install new one... but the error still occur...

just need to get advise whether i should HardReset my kaiser or flash back my Kaiser to WM6..