DNS not resolved when Used in Ubiquiti Dream Machine

Hello there! Happy user of NextDNS here, however since a week or two I have an issue.

I  use NextDNS directly into my Dream Machine with the Encrypted DNS fucntionality, occassionally everythign is slowed down, no way to navigate properly and no way to to access remotely to my Dream Dachine or Protect application (for cameras).
Is there something I can provide to try to resolve? Or at least investigate?

Thanks for your help!