ShiroKuro And what we concluded was that I may be sort of rushing to cover up the mistake, or replace it with correct notes, or rush to the next passage.
I had a bit of a "self examination" about this very topic not all that long ago. I usually play with a drummer so they normally try to keep a pretty steady beat going. There are times when any in the group start "rushing", not sure of all of the reasons. But I did get to thinking about me and why I do it when I do it.
There were several things I observed about myself. I think the #1 thing I did that turned into "rushing" was actually an uncertainty about the next note and "feeling for it" a bit ahead of time. And by the time I'd assured myself I'd found it, I'd played it, usually just a tad too soon. Add a few of those up and it's "speeding up the tempo". That tends to resolve itself as I become more comfortable with a piece and don't do as much guessing.
A second thing I sometimes catch myself doing is "speeding up" parts of a song for rehearsal purposes, usually parts I am very familiar with and really don't need the practice so much as I need to lead in to a section of the song that I do need practice on. I can get accustomed to playing it too fast and then if I'm not careful, I can get on stage and start out playing much too fast, mostly out of habit. It may not be an issue for many who don't have a long song list. There are times when we have extended gigs where there is up to about 5 hours of music, zero repeats. Just to play through every song one time, as it would be performed, no go-backs / repeats, takes a full 5 hours. That's a lot of time. So rushing through or even eliminating parts that just repeat, second / third verses, stuff like that, saves time and allows for some targeting of the more important things... intros, endings, solos, and just remembering the correct A section going with the correct B section, etc. And I do not play with music on stage. It's is ALL in my head. My music stand has a song list... name of song, key, and if there is anything peculiar, a few words to nudge my memory. (Probably TMI.)
I'm sure there are lots of other things that others have, individual quirks. Those are just two of mine. But it was an interesting thought process to try to pick out WHY I was speeding up when I shouldn't.
Of course, sometimes we just get excited and wanna go faster! 😃