Electrical Issues 2003 GMC Yukon XL

[Canuck78]

I have neen having the following electrical issues with My 2003 Yukon XL since I bought it new in July 2003.
It has been back to the servicing dealer 8 times in that time period and nothing is getting fixed.

Hard starting: On a random basis the engine cranks over without firing. It will crank forever unless i release the key and try again. May or may not start on second or third try. Dealer changed fuel filter-no cure. dealer changed ignition switch (not the key cylinder) no cure.

Seat memory: Up on inserting the key in the key cylinder the drivers seat will seek a new position,usually fully back. This will do this three or four times even after I reset the memory position. Then a month could go by without it being affected.

Repeated beeping: Upon inserting the key in the cylinder I hear 8 or 10 repeted beeps, same sound as seat position memory switch makes when seat is reset although that is usually only 3 beeps. Nothing happens after the 8 or 10 beeps. sometimes the beeps occur after startup and the truck is place in gear.

I have described these fuctions to the dealer on each of the visits and although thaey have been able to replicate each issue there has been no cure.
I have mentioned on many occasions that I suspect the key,the remote module or the key cylinder itself. The symtoms are the same with either of the two factory supplied keys and remotes.
The keys seem always "loose" in the ignitions.

Any thoughts on what may cause all the above and are they all rekted to some electrical component hooked up th the key cylinder itself?