Time to switch to cryptomator I guess...
Unfortunately Cryptomator isn’t as reliable as Boxcryptor.
I have not had this experience. I switched to Cryptomator because it was a much smoother and more reliable experience for my use cases. What issues did you have?
But I guess you can do the same with rclone given that it supports encryption, mounting and the local filesystem.
I am not sure however how they compare in simultaneous read/write access by multiple users.
Cryptomator has been good to me otherwise!