Always use the recommended cards. Several ppl using the U1 had issues (some even several months later) on the fb group and switching to U3 fixed the problem.
I have several and they are great. You also cannot beat Tactacam Reveal customer service. Top notch. Follow their fb group several customer service employees there to help anytime.
I own a Muddy Prevue 2 that has the see through mesh. I ,like you, mainly hunt stand for deer, but used it for turkey season this year and had great success. They are currently buy one get one free as well @ shop.gomuddy.com