Sorry to hear of your woes. I have one also, used once, no problems yet. I've had an 6-man Alaskan Guide that my wife and I have used extensively for about 7 years without a problem, other than severe fading. I did break a fiberglass pole for the vestibule, but replaced it with an aluminum one that has served well.
This thread has made me nervous about my new XPG, but it had features I haven't seen in an small 4 season tent - a couple of vents in the tent and fly to maybe keep the condensation down. We don't really need a 4 season tent here in ID for "Gentleman Camping", but it seems like with a just little wind, cold air flows under the fly and a screen top tent doesn't do much to slow it down. I thought that XPG would be the answer..... Maybe not...