Garmin Windscreen Mount problems.

I purchased a Garmin Nuvi 310 almost 4 weeks ago & have been reasonably happy with it until today.

I hadn't used it for a couple of weeks & needed it to find an address, when I put the receiver into the bracket I noticed that it was loose on the vertical plane, so initially I flipped the suction cup 'lever' to refit the bracket, this is when it all went 'pear-shaped'!.

Well, I couldn't move it a millimetre, I tried lifting the little tab on the suction cup itself, still stuck like the proverbial to a blanket.
In the end I had to work all the way around the soft plastic suction cup to remove it from the screen, this left a black ring of plastic still stuck to screen which had come off the suction cup, obviously rendering it useless for reaffixing.

I live in Victoria, we have had a few days with temperatures in the low to middle 20s & the suction cup had obviously 'melted' to the screen.

My question is, why would they make the suction cup out of black plastic?

I have had 3 previous GPS/Navigators prior to this, a Mio (POS), a Tom Tom (same) & a $100 generic no name Ebay one which was excellent, now all of this had clear plastic cups, the most recent, the Ebay no name Chinese 'special' was on the screen for 13 months with no problems.

I suggest that Garmin owners try removing their brackets to see if you have similar problems.

Garmin have offered to send me a new bracket, which is fine, UNLESS, it too welds itself to my screen after 2 weeks!