Dropped frames - iMovie vs FCE only from Canon, not Sony

Question

I have tapes shot on my new Canon Elura 100, SD, that import without complaint into iMovie but show lots of dropped frames in Final Cut Express. Imports from by onld Sony TRV never have a problem. Any idea what is going on?
Note - I used a Sony TRV-30 for years without a problem. I just picked up a Canon Elura 100. Now I get dropped frames all over the place on FCE import for tapes shot with the Canon. Out of interest I tried importing the tape shot on the Canon using my old Sony and I get the same problem. Tapes shot on the Sony have no problem. So evidently there is something on the Canon recorded tapes FCE does not like. The playback appears fine. iMovie import goes without a hitch. FCE I get a dropped frames notice and there are pauses in the playback of the imported video.

Answer 1

I rechecked and saw I was also starting to get dropped frames with the Sony, something I had not seen in years. Evidently there is something in my system now (perhaps 10.4.9?) that FCE2 does not like. I rebooted to an older installatioin of 10.3.9 and now both cameras are coming in without dropped frames.
Note: there were other Firewire devices connected, but not powered up.
I did not try changing the setup. Once I was in 10.3.9 everything came in.