I was riding today when zwift froze my entire pc. Earlier that ride, it also gave me the message “connection disconnected”. I’ve been using using my phone for the past few zwift rides and have had no problem. I use an Asus Vivobook with a Saris M2 trainer.
Please post up full details of your PC’s specs.
Sadly there is a long thread about this sort of thing - [Zwift Crashing/Freezing Mid ride - Bugs and Support - Zwift Forums] - you will need to search, because the forum doesn’t allow links to be posted.
My guess is you fall into this same category and Zwift doesn’t seem to know how to fix it.