Bought a HH4 few months back and didn't even connect it for a cpl of months.
Last month, HH4 kept crashing, rebooting on its own and then showing an orange light. My TV would also reboot. Changed cables, plug sockets etc, no difference
Reverted to HH3 and no issues.
BT support and less than woeful and if i could strangle them, i would
Keep HH3, send HH4 back and ask for refund. If it ain't broke why fix it. Do you need the 5GHz frequency, it's about the only reason to use the HH4.
Bought a pup then?