I had a problem with DNS over TLS with PIA this sounds very similar. The conflict was DNS encryption type. I use Gluetun infront of PIA and the DNS resolver defaults to DNS-over-TLS on TCP 853. Through PIA’s tunnel, port 853 is blocked or doesn’t work reliably. SO I switched DNS to DNS-over-HTTPS on port 443 (I used Cloud9), which PIA allows and Gluetun can actually use. Not sure if this is you issue at all but if you have a common ARR stack with a vpn through gluetun this very possibly could be
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