Its been a while since I used PHD2 but isn't there a menu box about what type of signal goes to the mount? Like direct guide, pulse guide, camera relays.
Perhaps you have accidentally changed one of those settings.
Just a thought, probably unlikely but who knows.
If its any comfort it often blows me away that even if you have an observatory and the same setup night after night how something can fail to connect or need some attention.
Its hard to keep an observatory in an unchanging static state.
Greg.
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