We've not had great success with airpots in the past year. Is it a matter of "you get what you pay for?"
The glass liner of one brand we carried would explode (or implode) while sitting on the counter, undisturbed. Fortunately we have been reimbursed for those defective items. Another brand is just...well...cheap.
It has become a disposable item, I'm sorry to say. Is there a brand and model of airpots that are decent quality, affordable and worth repairing when the liner does eventually break?