R10 missing shots at the range

Hi everyone. I purchased a Garmin R10 back in Spain, it was working very good, maybe some shot shapes were a little off, but in general very accurate. I came to the US and updated the R10 to the latest firmware. I went to the range here and the R10 started missing a lot of shots (maybe 30-40%) making the Golf simulation unusable. The particular range where I go is right in front of an airport, so I thought it was maybe because of that, but I tried a different range and still the same problem. 

I emailed support and they sent a new unit. I updated it to the latest firmware, went to the range and still had the same problem. I tried with a new phone, still the same. 

I can't tell if the problem is with the specific range balls here in the US, the concrete, the firmware update or something else, but when I was using the first unit in Spain it took 99% of the shots and now it misses a lot of them. Still the R10 is pretty useful only picking 6-7 out of 10 but I would like it to work all the time.

Any ideas?

Thanks!