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I have a VINYL EXPRESS R Series II cutter and my machine will ot finish a test cut and then the online light starts flashing and it locks up......Help I have to finish some signs and I don't know why it is doing this.

Newbie to vinyl cutting. Just bought a US Cutter MH871-MK2 to get my feet wet for a reasonable price. First test cuts came out fine. Beautiful stars. Then cut my logo out a few times no problem, then I did a 8 ft x 1 ft test which came out decent enough but I did notice that the cutter would pick up pieces of vinyl in some places and that not all corners had clean cuts (some over and some under cuts) Still made it work for what I wanted but wasn't extremely happy with it. Now I want to cut a very large project 9 ft x 14 ft space. I do not want to waste that much vinyl! So I read up on fixing some of the settings. Slowed the cutter all the way down. adjusted blade and pressure. Ran the test cut from the machine direct and it is absolutely horrible!!! Played with settings, added teflon lube to the blade holder, changed the blade, looked for debris, adjusted more settings....and still horrible. Totally at a loss as to what may be wrong. THinking I should buy some more blade holders as spares in case that is the problem. Attached is the picture and no matter what I do, it comes out equally bad, Over and under cuts at corners, straight lines are coming out curved. Please please please help!!! See attached pic. Sorry used my webcam and you see reflection of my hair in the way.Bottom left corner was under cut, right tip and lower right tip of star undercut, top left corner of square crooked as well as the bottom right, top left side of star distorted with curves and not straight.