My T pretty much did this exact thing with me- all rosy for a year with prompt real responses, then shifting without explanation into generic 1-3 line responses or no responses and saying I'm suddenly crossing boundaries, that suddenly she can't be there for me just bc I have a need.

aka "the feeling is gone."

I don't know about your relationship with your T, but this deterioration started after a major rupture when my T began to dislike me, and lost interest in doing the extra things like email/text for me. She told me she "didn't feel excited about it" anymore.

Maybe just try to let it go, or it will get worse (the T's resentment and withdrawal in response to our need for between session contact)....I think maybe they think the need will diminish over time, but when it doesnt they get annoyed? I dunno.