Get-r-
Before calling CS, do a two or three hour test of your temps (That is what Tony at CS will have you do). Apparently an empty cooker tends to have some pretty severe temp swings, and the overall temps average about right. When I did this test when I first got my 055, temps shot up over 300*, but then dropped below 180* (while set at 225). A two hour chart of the temps at 15 min. intervals showed an accurate average temp.
The beauty of this particular test allows for a two hour "research" time, unmolested to drink bourbon and smoke a cigar!
It may be a faulty therm, but apparently these extreme swings worry a lot of customers that call in.