G80 Distances and speeds

Hi I'm looking for some assistance with my approach G80. The radar feature is extremely inconsistent.

I generally swing on average 90-100mph but the unit is reading my hardest swings as 50-60 mph with pitching wedge for example returning distances of 70 and 80 yards when the ball generally goes around 120-130 (carry) do I have a faulty unit?

Bought brand new last month from Affordable Golf.

I have updated the unit as instructed  and set it up the same way every time I use it. I have had it recording the correct distances before but for the past week it's not been giving me accurate measurements.

Thoughts? 

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