Devices become unresponsive since 4.01 update. Is anyone else having issues?

After updating our company devices, some will freeze and become unresponsive which prevents satellite updates and message transmission.

We've done a lot of fault finding and have been unable to replicate the issue; It seems to be random.

Force power cycling the device seems to be a temporary fix but we don't know when it will freeze up again.

We have 30 Messengers and we never experienced this issue prior to the 4.01 update, so it's not a device issue.

I've been told that Garmin are working on an update but this has been going on for nearly 6 months.

Is anyone else having issues like this?