Hi have an excel workbook that I’ve been using for a few months, with several copy and paste buttons. Only recently have they stopped working after about 2 mins in of using excel all I get are these ��. When I load the spreadsheet they all work normally, but a while later they stop. Any advice?

I’ve tried resaving, close opening, restarting. The code works fine upon initial use, it just stops after a bit.
I’ve tried resaving, close opening, restarting. The code works fine upon initial use, it just stops after a bit.