As title, since installing 6.34.4 I'm having to reboot this thing daily. The unit completely locks up seemingly at random and fails to pass any traffic, I can't connect via winbox either so I have to perform a hardware reboot. Didn't have any issues since before this build.

Not sure what's causing it either. Not even sure how to begin troubleshooting. This is an RB750G

I would recommend reverting back to 6.32.4 (Bugfix only) and see if you have the same issues.

Hello,
I had much the same problem
At one point I did a little more accessed the router interface
By cons I always internet traffic
I have to restart the touch screen

I had the same problem with my SSTP VPN Tunnels. The tunnel would show up, but not pass any traffic. Logging in to the device showed no resource issues yet running a /export would not return any configuration. Rebooting the router would take a few attempts and there is a significant delay in the router accepting the reboot request.

Downgrading to 6.34.3 did not resolve this after the upgrade.

I had to downgrade to 6.34.2 to obtain a stable system running on a RB493G.

distantsoil, please contact MikroTik support (support@mikrotik.com), we will see what we can do.

I can confirm that downgrading to the earlier release has resolved my issue, I've seen no lockups whatsoever

I'll reach out to support and provide them debug info