Shortly after departing Juventus for Manchester United ... Ronaldo and his fam moved into a 7-bedroom pad in the UK -- but packed up and bolted to another palatial estate just days later.

As for why, The Sun says it's because sheep on the first property could not stop making racket!!

The report claims the soccer star was losing sleep over the creatures' sounds ... so "it was decided it was best if he and his family moved."

Don't worry ... Ronaldo's new place is apparently just as badass as the first -- minus the noisy sheep -- with The Sun reporting it's got a cinema room, a pool and a big garage.

Clearly, the moves haven't affected the 37-year-old's play on the pitch -- because he's been stellar in his return to Man U, scoring three goals in his first two games.

Of course, he did have an incident where a wayward warmup shot this week knocked a security guard in the head ... but, hey, with more sleep on the way -- we're expecting far less of that and far more goal-scoring.