I have a serious out of warranty problem with my SRM 280. The problem has gradually become worse over the past 3 months. The unit is 1 year old, light use strictly by me personally. At first, the unit would get "spoiled" if I attempted to use the trimmer line too long. Specifically, it would start well, but not allow full throttle until it warmed up. Now, it has gotten to the point where the problem no longer correlates with the length of my trimmer line. Here is the description of my problem: In the morning, it starts and runs fine (but not accepting absolute full throttle - slight loss of power). On the second lawn, it starts up great, but will not accept full throttle unless I either turn the unit upside down or let it warm up idling for about 5 full minutes. This continues for the rest of the day, with a recent loss of overall power. It always starts just fine. All the simple maintenance fixes have been done multiple times (air filter, spark, fuel filter, checked the exhaust screen, checked the check valve on the gas tank, etc) and the unit has been treated well with proper Amsoil mix, no dropping, etc. My question is twofold: 1) Could 87 octane be responsible? 2) Could ethanol be responsible? 3) Could using the trimmer line too long be responsible? 4) What do you think the positional factor of this problem means (runs better upside down)? Recently, even turning it upside down hasn't been working. 5) Could it be a collapsing fuel line? I will be taking this thing apart tomorrow to check for pitting and to basically inspect it. Thanks.