I realize that this post may be viewed as blasphemy on this site, but Im in serious need of help, so here goes. I bought an LX7 last january from Cabelas, and until this past weekend, it has been one of the best ice fishing investments ive ever made. Last Saturday, all that changed though. I fully charged my unit Friday night and Saturday morning it was off to the lake. For the first hour or so, it was business as usual, bringing a few crappies topside, but then the unit went on the fritz. Depth started jumping all over the place and seemed to be picking up a lot of interference, but there wasnt anybody else on the lake. After a few minutes of this, the unit finally settled back down and registered a solid 11 ft. Only problem was, i was fishing 27 feet and the unit was not actually working as I could not mark my jig at all. So, I powered down the unit, undid all the connections from the back as well as the power leads and then reconnected them all. Powered the unit back up, and everything was back to normal. Phew………..NOT!!! 15 minutes later the chaos started all over again. Redo the connections again and 10 min later, same problem. So, I fished the rest of the day with no flasher. When I went home, I put the unit back on the charger. It was on for maybe 30 min and then the battery registered fully charged, so I do not think it is a battery problem. Has anybody else had similar problems to this? Could it be a software thing?
Also, yes, I did try calling marcum service several times yesterday, left a voicemail this morning as well as sent them an email. No response yet………..
Please help! I’ve got a sleeper shack booked for Mille Lacs the weekend of January 25th, and I just might cry if the LX7 can’t come along. 
Mine does the same thing too! Try putting your unit in Manual mode,might help…When they work they are by far the best,but when they flip out,they stink! I wish Marcum woukd fix the problem,from what I understand this is still going to be the same with the upgrade.