Have seen a few situatiuons where power adapters have gone out of spec or perform badly.
At a guess I have just replaced these without measurement to fix an issue (luckily)
These have been on an ATA adapter, wireless adapter, WiFi security camera and now the possiblity of a router failing.
Hot days seem to bring on power adapter faults.
Has anyone seen a test breakout adapter with heaps of different plugs and sockets so that basic voltage and ripple voltages can easily be measured?