MK3 slow/misses exits sometimes wrong street/help-basically Nav gone insane

[Sparkles]

My nav seems slow in that it often tells me an exit after I've just past it. Plus, there are times when it just loses it mind. Sometimes the map shows driving parallel but a few streets over and once when it was ticked at me b/c I didn't follow the out of the way suggested route, when it should've caught up to me when I was on a road it suggested --the map drove me off-road up into the hills. It didn't sync for almost 30 miles.

I can't really trust it. If we are in an unpopulated area it does well. Fwy exits in LA? Can't keep up enough to tell me the right one unless it warns me enough ahead of time I can figure out which one it wants. Plus it would be really helpful to at least see roads coming up on the map but I mostly get roads I've past. Don't know if this adds to anything but sometimes I need to hit the accept screen again after driving awhile (maybe after going over a bump?). This happens often.

Is this fixable? Any ideas?

Sorry if this was asked before but didn't find much during a search. I have a '02 330cic with widescreen MK3 version V22.1 (1/63) which I believe is the latest version for the MK3.