35, 34 in front and rear driver side tires?

I'm happy to say you're looking for a problem where there isn't one. A mechanic's tire gauge can stick a little and give slightly different readings on the same tire. Same with the pressure sensors in your tires. Bouncing down the road will make the pressure readings change, but mostly tire pressures are affected by temperature. Driving causes the sidewalls to flex which develops heat in the tire. Even driving in one direction can have an effect when the sun shines on the tires on one side but not the other.

I have tire pressure sensors on two of my vehicles. When they were a new novelty to me, I drove around with the readouts showing on my dash. Now that I'm used to them, what worries me is when the numbers don't change as I'm driving. I wonder if a sensor is stuck or if the computer has locked up.

Also be aware that on most vehicles, it can take up to 20 miles or a half hour before a sensor reports the correct pressure. On my Ram and Caravan, that is done so no programming of any kind is needed after rotating the tires. The computer has a strategy to learn which sensor is reporting for which corner of the vehicle. During that learning process, no readings are updated or changed for up to around 15 minutes. After that the numbers will change to reflect the correct / current pressures.

In short, what you're describing is normal operation. If you switch to a different screen on the dash, it will revert back to warn you of a tire going low if that happens. Other than that, put it out of your mind. And enjoy the drive.

Tire pressures have a direct relationship to weather. It is not abnormal for them to fluxate a couple psi each way. When the air gets cooler in the fall/winter the air molecules in your tire move slower and contract, thus taking up less volume. This decreases the air pressure.

A general rule of thumb is for every 10 degrees of temperature fluctuation expect a change of 1-2 psi per tire.