I suspect that the cable that attaches to your tuning knob needs adjustment. It can be either too tight or not tight enough.
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Do you have a good antenna connected to your tuner? At least a decent dipole. Check the connections and experiment with orientation to get the strongest signal. Also, when you got the caps replaced, did the tech "properly" align the tuner? This alignment is very important for keeping the channel locked in.
I have 3 Sansui 9090DB receivers, all of which drift off station after about 15 min. I suspect a capacitor changing value when warmed up. Obviously a Sansui design flaw, or poor line of caps. Again, maybe a transistor is changing value when warmed up. Can anyone advise me where to check? I have a schematic I downloaded a few days ago. Others must have experienced this as well. I live in Phoenix, Az. where the air is dry, and is why I suspect a capacitor.