Got a Kenmore clothes dryer. It's hesitating. It works but periodically it acts as if the electricity cuts off a split second and then comes back on again. It's not a predictable pattern but it's frequent. It also makes a thump when it stops and starts. Anybody have a diagnostic hypothesis?

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13