@frida Radio wave progagation is affected of sunshine/night, among many things. I wonder if it really is the sunshine that deteriorate the connection. Have you seen any difference between sunshine in urban and desolate places? Bluetooth operates in the 2.4 GHz region, same as many WiFi routers and much more, so there can be a lot of interference from other devices that may affect your connection. So a thought; do you have more 2.4 GHz devices nearby in sunshine than in the night? I'm not expert.
@frida Hmmm. I couldn't resist to ask some geeks in a Matrix group (Mintcast). Not a known issue from those few. Speculation if still interference (eg if urban area in city a lot of devices of all kind in 2.4 GHz are active and more so in daytime). (By the way, 2.4 or 5GHz WiFi around in apartment?). Another sun heat radiation, warming up the headset, affected by heat.
By the way, brave and cool you use Arch, I haven't tried so far!
Sorry, no good explanation. Hope you don't mind I interfered.
@hehemrin Rather the opposite, actually, and I have no dropouts at all in my apartment, for example, which is pretty crowded Wifi-wise. It’s very much correlated with lights and nothing else. My guess would be that this pair has some very specific physical flaw that happens to trigger the error in certain conditions maybe? Still seems a bit far fetched perhaps but the electronics *are* getting very small, on the other hand.