Speedometer/dash needs to be reset every few days. Everything else is fine.
IIRC, this model has a history of failing instrument clusters.
Other possibilities include a failing alternator which is putting-out wildly varying electrical current,
or–maybe–a failing Totally Integrated Power Module (if Chrysler was using the TIPM in 2003).
For my Chrysler vans, I’ve found good model-specific help at the minivan forum at allpar.com.