OK, I have now officially given up with my Hub 5, due to it rebooting so much. I have put back my Openreach modem and Hub 3.
However it keeps failing the new firnaware download, any ideas....
|10:53:31,28 Dec.||CWMP:Event code:7 TRANSFER COMPLETE, Status:Download failure|
|10:53:31,28 Dec.||CWMP:session completed successfully|
|10:53:30,28 Dec.||CWMP:session start now, server:https://pbthdm.bt.mo, Event code:, M Download|
|10:53:29,28 Dec.||CWMP:DownLoad File, File type:1 Firmware Upgrade Image, File Name:pbt/firmware/HomeHub3V100R001C01B036SP05/HomeHub3V100R001C01B036SP05_L_B_encrypt.signed_fix|
|10:53:29,28 Dec.||CWMP:DownLoad File start|
|10:53:27,28 Dec.||CWMP:session completed successfully|
|10:53:26,28 Dec.||CWMP:session start now, server:https://pbthdm.bt.mo, Event code:, 6 CONNECTION REQUEST|
You could try a factory reset of the Homehub 3 by pressing a pin into the recess button on the rear for about 20 seconds.
Alternatively you could use the Homehub 5 as a router connected to the Openreach modem if you still want to have the dual band wireless and the 4 GigE ports that the HH5 has. This does away with the VDSL modem connection of the HH5 which would appear to cause the reboots.