This is unfortunately a known issue with MacOS and FTDI devices. FTDI makes the chip that Ruida and TopWisdom use for their USB serial ports. Apple includes a driver in MacOS that handles ‘virtual serial port’ devices, including the FTDI chips, but if you have the FTDI driver installed (and most do) they basically fight over who gets to talk to the port, and it gets locked out until you cold boot the machine. The PC doesn’t have this problem (not even a PC running in Parallels on a Mac).
This is a walkthrough of how to fix the issue from the terminal on the Mac:
The alternative is using Ethernet, though at the moment I don’t have Ethernet support implemented for TopWisdom, but I’m hoping to get that going soon.