after 30 mins the resistance is to high

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my elite arion digital smart b+ smart rollers are so much fun but im having a problem and im just wondering of anyone else has has issues, the rollers work just fine for the first 3o mins but after that when the resistance goes up over like 250 watts, is so hard to turn the pedals over even in granny gear once the zwift applied resistance backs down it eases up but there is definitely a problem there.....but like i said the first 30 mins or so are just fine......thanks for any advice

[Elite Admin S]

It seems some kind of disconnection.
Did you notice if speed freezes in the same moment?
Does it happen always after exactly 30 minutes or is it random?

Regards