Headed from Northern IL to Denver. Taking our time over 5 days. This morning headed out I checked the Tire Linc and one of the tires was down to 17psi. So I put the spare on and fortunately about 8 miles away there was a great truck repair shop and they checked out the bad tire and the valve stem had a slit in it. They fixed it, swapped it out with the spare and late in the day we get within 20 miles of our overnight stop in Ogallala, NE and I see on the TireLinc a different tire, same side was very low. I pulled over at the next exit and tried to put some air in it to possibly make it 20 miles and air is leaking out of the valve stem. It looks like another slice or slit. What are the odds of TWO valve stems going bad the same day? Is this just bad luck or is this a known problem? The tires were aired properly, the temperature never got too hot and I don’t go over 65mph. Not that any of those factors should have anything to do with valve stems, IMO. 2023 Reflection 150 270BN, Goodyear Endurance, ST225/75T15, Load Range E.