I have a new 2014 Ranger 900 Browning Edition with the Glacier Pro system including hydraulic lift & angle that I bought in Sept 2014. I'm having the same issue that started the first time I plowed in November. The plow quick-attach upper mount disengages multiple times every time that I've plowed. One time I was plowing with it angled at 5-10mph and the plow jammed under my Ranger and almost punctured my front tire. Fortunately we haven't had too much plowable snow here in NH, since I'm concerned about damaging the plow or hydraulics when the plow falls off and gets caught under my Ranger.
When I brought it to my local dealer, they charged me $121 to replace the mid-mount - saying that it was damaged. My reply was that it makes sense something might bend when it falls off during operation repeatedly. The new mount has made no difference, as it still falls off quite easily. This mount design is so defective, that if I raise the plow an inch or 2 off the pavement, and give it a couple of kicks with my foot near the top of the plow, it falls right off. My original Glacier plow on my Sportsman (that I've been plowing with for 12 years) has never a single issue. However, it has a pin that locks the plow frame in firmly.
The dealer is contacting Polaris again to see if they'll acknowledge the design flaw, and will provide a decent fix. For now, I've used a bungee cord tightly wrapped around the quick connect latch to hold it in place. This seems to be working OK, since it isn't falling off when I kick it any more.
I'm certainly VERY dissappointed with my new $3,000 plow, and could not recommend it to anyone right now!
Although I do love my Ranger with the full cab and incredible heater! What an upgrade from being cold and wet while plowing on my Sportsman.
Hopefully if several of us report this issue to Polaris, they'll recognize that they have a problem and develop a fix for it.
Kevin