I’ve been using a rebranded Flashforge Adventurer 3 (it’s actually a Bresser Rex that I got 50% off at Aldi) and have been really happy with it. The build volume is a bit smallish, but for most of what I’m doing it’s fine.
So today I boot it up and after a while, it just hangs after a minute or so. I switched it on and off, did a factory reset, tried disconnecting mains for a while, nothing helped. Also checked my DNS blocker to see if some internet requests were getting blocked.
But what did work - weirdly enough - was to deactivate wireless. It’s a small nuisance copying files over via USB, but one I can live with. At least I can continue printing!
Have you tried power cycling your router?