Updated Mavic to latest firmware today. I have 1/2 year of totally problem-free experience. Today, after update, had at least three extreme failures, very dangerous.

At some moment, few minutes after flight starts, Mavic just reboots or something like this: connection to remote stops for a minute or so, video recording stops, gimbal loses it's orientation mid-flight. The basic remote controls still work, but everything interactive fails completely for a minute. And it's not the app, since recording fails too and gimbal goes crazy.

Anyone had similar problems after update?

Yes, I call it "gimbals gone wild" and there are many reports of this, and while it's very disconcerting for someone using FPV, it's only the gimbal that's affected and not the behavior of the aircraft in flight. It's not really a new problem but does seem to have become more common since the latest firmware update, and here are just a couple of the many threads where the problem is mentioned:

Mavic Flipped Suddenly but Recovered
Mavic Gimbal freak out during flight. 2 videos.

But it also happens together with signal loss from Mavic and video recording failure, so it's not just the gimbal. Had it few times today again.