I think this situation is very odd, given the connection you have established with your therapist.

The connection with my therapist definitely waxes and wanes, and that is alright. It happens in all relationships I think.

Is it just me or does this feel like it came on all of a sudden?

Have you started any new medication? Some of them can be profoundly numbing.
How are the other relationships in your life? Are they getting stronger, or are there problems there?

All in all, if you feel like you are still on a path of healing, then the best thing you can do is keep showing up. Sometimes therapy can be astonishgly boring when change starts to come in increments, rather than leaps.

This may be the entry into one of those phases.

Although it may seem counterintuitive, but you may need to reduce the frequency of session.

Take care. Good luck today.