I was just about to post a new thread about this problem with a RUT955.
After either the device reboots, or the mobile signal has to reconnect, the OpenVPN never reconnects. I have to manually disable, then re-enable the OpenVPN.
It wouldn't be such a major problem, but it means there's no internet connection on the network until I log in and either disable/enable the OpenVPN, or disable the VPN completely and set the DNS servers back to the SIM provider default.
This is with the current RUT9XX_R_00.06.07.7 firmware, and using NordVPN.