Question: After a tire has been patched, is it possible for it to lose air slowly and without notice, and then suddenly deflate completely one day? In July, my right rear tire got a nail and was patched with a mushroom plug. I check the tire pressure every time I park, and it generally stays normal with some fluctuations. I've refilled it once or twice. In October, the right rear tire suddenly lost all air. The mechanic couldn't find a leak using the water spray or submersion methods (I suspected someone let the air out). After refilling, it seemed normal, though I did refill it once more (I thought it was due to the drop in temperature, but it was slightly lower than the other three tires, so I didn't think much of it). A few days ago, I parked at my work garage (the tire pressure was normal before parking), and when I left work in the afternoon, I saw the right rear tire was flat on the ground. It has been a few days since I refilled it, and it seems normal now. I'm very worried it might suddenly deflate again one day. [Crying]

The tire loses air slowly, needing to refill every three to four days, but the tire isn't damaged. What could be the reason?

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