Switching to PCM isn't a fix, it's a workaround that lowers the potential quality of the sound output by the box.
When you could be enjoying proper discrete 5.1 surround sound, you'll just be getting a PCM stereo signal. You could apply Pro-logic processing to it but it's not nearly as good.
BUT - If you don't have the equipment for surround sound - more than two speakers, amp, etc - stick with PCM stereo, will sound no worse.
I notice these tiny drop-outs quite regularly (video stutters occasionally too) but will live with them for now until the box's firmware matures and things like this get fixed. I personally get more enjoyment out of sticking with proper surround sound with the odd glitch than dropping back to 1990's era stereo!
I am in an over subscribed area - Fault ref F003066490
I have a new Yamaha Amp costing over £500 with both an ATMOS speaker set up and Dolby DTSx I do not intend to switch my setup to an inferior sound setting such as PCM just because Virgin can not get there act together and get this issue sorted its been like this for over 8 months now and most likely longer.
I have had a look at SkyQ boxes and it does not happen on that system so will be looking into a change if this is still present in the next few weeks
Its bad enough having to live with the absolute awfully slow menu system for the last 6 years or more (Tivo) and now the sound is up the creek and still no sign of it getting fixed.
Very poor service for something that costs me over £100 a month