Powernode N331 & BluOS 4.18.18

Today I upgraded my Powernode N331 to BluOS v4.18.18 and after turning on the tv (LG C4) via the Apple TV 4k (1st gen) I noticed a number of pops coming from my subwoofers (REL HT1205 mk2). This did not occur previously.

Additionally when switching from stereo to dolby digital (I have a home theatre group), occasionally a few seconds of loud screeching comes from the speakers before playing normally. This did happen sometimes before the upgrade, but now it’s much more often.

And finally I’m quite sure the subwoofer output is louder than before the upgrade. When watching DD 5.1 shows the subs are much more active than before, more background noise can be heard where before it wasn’t as pronounced. I’d describe it as constantly rumbling. I’ve only recently retuned the setup and this change immediately made me wonder “whats going on?”.

Can support or perhaps others verify this behaviour?