Hi my 03 wrx has lost it's boost it's running a vf 35 turbo pinks sti intercooler etc has been mapped for the mods and has been fine for the last 6 months last week the boost died just feels flat I swapped out the boost solenoid and problem solved for a day or so and it's now back with no boost turbo sounds fine no smoke from the exhaust engine sounds fine I've checked all the hoses I'm totally stumped as to what is wrong with it can any one help