Tacx Magnetic Resistance

Hi All,
My Tacx turbo, 2650 I think it is ,seems to have lost some of its power. (Basic dumb trainer)
The resistance through the lever even on 11T cog doesn't seem to be as hard as it once was.
Example:
Lever at 2, Cassette on 3rd last cog at 94rpm would throw a reading of roughly 32kmh. Now it's only reading 24/25kmh and the resistance on my legs is a lot less.
I haven't improved that much since I last used it a few weeks ago. :D
Would tyre pressure or even the tightness of the roller pressed against the tyre aid or hinder the resistance?
I'm thinking not.
Anybody ever have this issue or hear about it?
Apologies for the long post.
Thanks,

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