This seemed like a classic bad igniter symptom. However, the igniter tested good with an ohmmeter. Not a surprise, these things may test OK when cold but fail when hot. Since this was an older dryer, I gave the customer the choice to replace other normal wear items (gas valve solenoids and flame sensor) with a relatively small price increase that could save another repair possibly in the near future. All 3 items installed, dryer works great!