It may be old but is it clean? That is, these things tend to vacuum up lint and dust so is it time to consider cleaning the unit inside and out?
Get a tech if you don't do your own work.
It does this several times, then stays on for the whole night. Bulb, color wheel, capacitors, fan? Seems like if it was the bulb it wouldn't stay on after a time. Bulb IS old and am thinking I should replace anyway. Is that easy to do? Where should I go for quality/price? Thanks for your help.