iPad Pro loses gps fix

I have an iPad Pro 12.9 2018. It loses the gps fix at random. I’ve tried all the standard things recommended from Apple, nothing, I repeat, nothing fixes the problem!!! I own a 42 sailboat and I run two iPads, an iPad Pro 12.9 and an iPad Air 2 with the identical navigation apps within 12 inches of each other - only the iPad Pro loses the gps fix, the iPad Air 2 has never lost a fix! I’ve installed the latest iOS from Apple, never an improvement. I run a Facebook page on coastal navigation, there are a dozen users of iPad Pros and iPhone X with the identical problem on the forum. This problem is widespread. I’ve taken my iPad Pro to an Apple Genius Bar and was offered a replacement. I asked, how do I know the gps chip has been fixed? He had no answer. The problem is NOT confined to just my iPad Pro! There are many others on the same boat.

I need a solution, not just yet another recommendation to do yet another hard reset or yet another complete wipe back to new conditions - that does not fix the problem! What do you recommend to fix this widespread problem which is Not confined to just me or a #mall group of iPad Pro users?