Very high initial power required to get Kickr started in erg mode

I have a fairly old Kickr (2014?) and when I start pedalling in erg mode (I’ve not actually tried it in non-erg mode but I always use erg mode so that’s what i’m trying to solve) it requires me to stand on the pedals and push seriously hard for a few seconds before it will go down to the warm-up power. This wouldn’t be any issue but with cold muscles this morning i pulled my left abductor muscle so now I’m trying to find a solution to avoid issues in future. Any idea why this is happening and if it’s possible to fix?