More Asset Browser updates; New guided tour; Bug fixes.
If I’m paying for a subscription, the minimum I expect is a stable, reliable environment to work in
This is exactly what the stable releases are for - you can expect more stability and reliability with those releases:
construct.net/en/make-games/releases/stable
It's tempting to use the latest features with beta's, but you should expect issues and it sounds like you'd be best of just using the stable versions.
will said and completely agree with you.
In addition to Tom's comment, we're not aware of such complaints from any other beta users at the moment. Mysterious problems not experienced by other users are frequently caused by browser extensions interfering with Construct, rather than being caused by Construct itself, so try disabling any browser extensions you have installed. Otherwise in order to investigate any stability issues with Construct you'd need to file an issue following all the guidelines.