Mine is no longer being used - it worked fine and then suddenly the volume would rocket upwards causing sudden anxiety as my Focal speakers were on max volume!! I had to run and hit mute and thankfully speakers were fine. After it happened a second time I became afraid to use it. Now I use the plastic remote that came with my 52. Works fine but doesn’t light up in the dark and has none of the hefty feel of the Flash.
not sure if this can be fixed. If it could and was guaranteed that this sudden volume problem wouldn’t happen again, I would fix it. Beautiful piece of engineering- except for battery compartment.
Mine has recently been doing the same - very scary. The Volume Up command stuck fast one evening (I'm sure self-prompted by the unit), which was very difficult to see in half-light - I think it's done this 2x of late. I now point the Flash away from the 552 when not in use - and the batteries aren't running down with any speed which would suggest a recurring issue.
I've also had the source change unprompted by me on the 552 a few times (i.e. up one = silence) - and wondered if this is down to the low sun we get at this time of year/my Pio plasma TV giving off stray waves or the 552 (unlikely). None of the kit is in direct sunlight.
My Flash has had a few foibles e.g. stating low battery levels very soon after new batteries have been installed - but removal and a bit of un-powered resetting time (an hour or so - better overnight), has normally fixed things.
X-fingers, for now mine is OK (just?) - and I much prefer it to the other Naim remotes.