Where are you putting your captured files to now?
If you’re capturing to your C: drive, this is likely to be the cause because it’s the OS HDD.
Try setting the capture folders and temp folders of Premiere to a spare drive (possibly an empty one).
Dropped frames can be caused by fragmented drives (HDD has to jump to next free sector while recording) or other processes that access the same HDD during recording (such as the OS itself does many times a day)
Regards,
Thorsten