I just spent hours diagnosing why my Groove AHn2 died after upgrading from 6.49 to 7.2
Post-upgrade it ends up in a reboot loop. After breaking the loop with a factory reset, I could gain access to Groove.
I discovered that simply enabling the WLan radio causes the reboot loop to start again. (No other settings entered)
I downgraded back to 6.49 and all is well. Just letting you know!