At the beach this morning and was zig zaging around in the dry sand. I know this time of year finds are limited and you can go awhile hearing nothing. The simplex was really quiet and as simplex owners know it does chatter occasionally. I figured I would ground balance and noticed the screen was completely frozen, every button would not work, nothing. To make a long story short, two or three times this happened (in less than an hour), frozen screen no buttons working. I had to push and hold the off button for 5 to 10 seconds for the the machine to reset (during reset the screen would shut down and show 5 to 6 vertical lines when turning off to on), I figured out it would happen when I would hit or bump my coil on a hard surface to knock the excess sand off my coil to make it lighter to swing. I would only hunt in all metal so I could tell when the machine would freeze, has anybody experienced this?