Well that'll show his loyalties lie to leaving the club and sticking with Raiola which is fine. If he wants to stay then Raiola needs to be 1000 miles away.
I genuinely don't know if it's Pogba telling him to talk or if he just likes to talk 24/7 - didn't Raiola come out and say a contract was going well and would be sealed soon?
Either the club have pulled the plug on it fearing he's passed his best and isn't worth 300k + a week, or he's decided he wants to go back to Juve. It's just very odd timing. Why would your agent want to mount even more pressure on you when you've not been playing well?
In the summer, Raiola was talking about how his side and the club are taking their time on negotiations. Both sides were on the same page, but knowing that United tends to act slow with most of the contract negotiations, this might just be Raiola putting pressure on United to take action and offer something desirable. It's been a while since there has been any news on the club actually submitting a contract offer, anyways.
The fact that this is happening also tells us something about Pogba and whether he feels uncertain about his own future. In the past summer, Raiola did nothing to AC Milan when Ibra was negotiating his new deal. However, Ibra wasn't generating much interest elsewhere. Before this, however, he had a huge outcry over Donnarumma back when his contract had to be renewed. Basically, Raiola will become annoying when his client is in demand, which Pogba is (Juve, Real Madrid, PSG). Towards the end of the last summer, he was talking about contract renewals as Pogba did lose a bunch of interest (mostly because he wasn't affordable).