I'VE TRIMMED OUT MANY HOMES , BUT I'M STILL LOOKING FOR THE BEST METHOD OF KEEPING MY TRIM CORNERS ON DOORS & WINDOWS FROM OPENING UP IN DRY WEATHER CONDITIONS MOST NOTABLY IN WINTER . DO MOST GUYS BISCUIT THE CORNERS OR IS THERE SOME OTHER METHOD?

I always back cut them a little so the faces fit tight, then glue them and cross nail them. I don't have any problems with them.