Shuji at Zwift HQ here. Looking at the server logs for you - I’m seeing two Windows computers being used, with these CPU specs:
Intel(R) Core™ i3-2100 CPU @ 3.10GHz
and
Intel(R) Celeron(R) CPU N3350 @ 1.10GHz
Intel introduced these two CPU’s in 2011 and 2016 respectively. While Zwift runs on computers with modest spec, the 3D graphics still put a decent load on the computer’s CPU and GPU. It is possible that these machines are having a hard time running the game and are shutting down. We had a recent thread where some of players reporting in have a similar issue running older machines with modest inbuilt GPU’s.
Do you have a tablet / smartphone / laptop that might be a little more current? Zwift can run on iOS / Android / Mac / Windows / Apple TV platforms.