Hey, this is a known issue in version 2.5.15, and it affects users on all platforms. The team is already aware and is looking into it.
For now, the best workaround is to roll back to the previous version. Download it from Cursor · Download and install it over your current build.
The main thread is here: [2.5.15] Connection Error. You can subscribe for updates there.
Let me know if the downgrade fixes it.