I have purchased about 8 exmark Lazers in the past 3 years and I was wondering if someone else has had the same problems that we have had on all of our Lazers. The deck height starts out at 4" on the preset lever and by the end of the season they change form 1 to 2 in. lower in height. This has happened on all the Lazers we have. We checked tire air also changed pins ect. would like any input that might help thak you.