A big unknown planet has crossed the path between Voyager 1 and the Earth, blocking the radio signals for 2 days !
(This is not impossible, because a planet so far away would have an extremely low angular velocity, so an occultation could take so long even for a not very big planet.)
If we are speculating, why be so uninteresting?
Maybe it was waiting to go through the inter-solar customs line to get out.
Maybe it has gained sentience on its own and is trying to awaken other space probes.