Not sure where to place this so here goes:
I installed a GS20 with security and a GS110-24P switch, and 3 GR10 APs for a small retail location. Everything ran smooth no network issues...it just worked! 4 weeks later, all devices on the LAN are having horrible connection speed to the internet .4 down and .1 up. Connecting a pc directly to the cable modem works fine with speeds of up to 800 down and 40 up. I have rebooted the Meraki router and switch, same results. Please help!!! This is a retail business and they are not able to use their web-based POS.