MY INTERNET SPEED IS WAY DOWN

IT IS NOW CLOCKING AT 85MPBS I PAY FOR 500MPBS (MULTI TEST SITES) . IT USUALLY GOES OUT ABOUT 285 TO 325MPBS BUT HAS RECENTLY DROPPED. i AM HARD WIRE TO MY MODEM AND HAVE RESET IT TWICE FOR OVER A MIN BETWEEN REBOOTS. THE ASSISTANT IS OF NO HELP. I NEED A TECH TO CHECK AND MAKE SURE I AM RUNNING CORRECTLY.

THOMAS