Hi, new crash for box.

Not nice - whats directly connected to the receiver?? (usb, hdmi etc)

External hard drive has own power? (Although seen many posts were a hdd has dropped - but doesn‘t kill box).
Suspicious on hdmi switch - how is CEC configured?
Might be worth reflashing receiver as a starter
<3>[93472.111976] blk_update_request: I/O error, dev mmcblk0rpmb, sector 0
Thats the emmc and used (i believe ) only by the receiver at boot up time
External Hard Drive powered by receiver

Not always a good idea, the recommendation would usually be for the HD to have its own power supply.

You could try using a powered USB hub.

What cables do you currently use to connect the HD to the H7 ?
A powered USB hub will have normal-sized female USB-A (female) connectors.mini usb to usb, any suggestion, please?
mini usb to usb, any suggestion, please?
https://www.amazon.co.uk/ADVENT-Port-USB-model-HB212/dp/B00ATDOVLM