Implausible SUP speeds

Just upgraded to a fenix 6 from a vivoactive 3. I realise there are old posts on this from 6 months ago but did anyone find a solution please? Apparently I managed to achieve a maximum speed 348196.3miles per hour on my first paddle, down to a poor 22356 mph on Saturday RoflRoflRofl

I was paddling my usual routes both times that I never had any issues with the vivoactive 3 tracking. Both were only 4 mile paddles.

Really disappointed with the fenix so far as it’s performing worse than the old watch I “upgraded”. Really appreciate any advice on how to fix.

Thanks.