I too have ad this issue. The only resolution was to restart my PC which is not ideal as I restart my PC once every 2 - 3 weeks.
This port was not in use and does not appear to be reserved by Hyper-V using “netsh int ipv4 show excludedportrange protocol=tcp”.
Would it not make sense to allow the user to set a port in the settings, keeping 59100 as the default?