Internet intermittently dropping since Monday July 27

I had no issues whatsoever until last Monday.  Now my internet, drops multiple times an hour.  I workout of my home and so does my wife.   We have virtual school starting for the kids on Monday as well.  I have spent multiple hpurs a day with the Service level one techs.  They cannot help.  Ineed someone that can fix this.  Calling comcastis pointless.   They first said it was an outcated modem, so they sent me a new one.  It actually got worse.