Anyone else ever have a problem with the depth finder not keeping up with the boat speed? I only have a 40HP motor, this limits my max speed to about 25-30 mph. However, once I get above 15 - 20 the depth finder no longer registers. I have to slow down tremendously just to get a depth reading. I was wondering what everyone else does if/when this happens and if there is any advice out there. It is a Lowrance Mark X Pro.