Spikes in power from WattBike

Hi All. Last couple sessions on a Wattbike at my gym I have noticed massive (33k watts) spikes in power readings to my Garmin fenix 5 plus. I believe this is also happening when I am using laps. I havent noticed it while riding a long. So if I press lap and then 2-3min into the lap the watts will spike up for a second to 33,000 watts. I dont see this on the actual Fenix as all the numbers wont fit on the screen but I can see the watts jump up to around 450 watts and then of course the lap watts is incorrect until the end of the lap. Very unusual and I havent seen this before. Any ideas as to what might be causing this to happen. Image of watt reading and fit file attached. Could you please have a look and let me know if you noticed anything? Many thanks ciq.forums.garmin.com/.../1461045.png