I got a 1025r filb with a 54 inch mmm back in June and have been loving it all summer, however the last few times I have mowed I have been having a problem with the front mower deck arm coming unhooked while mowing. It's always the same side, and sometimes it's off in the first minute of mowing and sometimes it takes longer. In the pictures the arm is above the hook but most of the time it hangs down below. I am just wondering if this is a deck level issue or something else I can take care of or if it is a dealer issue. Thanks for the help.