You got a neighbor with a universal remote that's tuned to your decoders IR frequency & he's messing with your head.
Seriously though, since both box's do this at your place & not at the Retailers shop, then it seems like a IR frequency problem.
Something to try out to eliminate the source, take the batteries out of all remotes in your house, then use the volume control on the decoder if it has one, if not put the batteries in the Humax remote then turn the volume up & while holding the up volume button remove the batteries so it cant turn the volume down again just in case it is the Humax remote that is stuck or faulty.
If the problem reoccurs with no remotes being powered then you will need an expert to track the source of the interference.
Edit: forgot the next bit, oops.
Now if the volume stayed up with all the remotes battery free, then put the batteries in each one until the problem one shows up. Then hide it.
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