We use the EX3110 - AC 750 Dual Band WiFi range extender for the office upstairs. My girlfriend works from home and does video calls or phone calls, depending on the client. Usually the extender works great and we get the same latency as our original router, but for the past week we`ve been getting less than 2 mbps download and upload speed and she can`t work. Nothing has changed... When we called our ISP, they recommended we change the modem, so we did. Same issue persists. This happened out of the blue without modifying any settings. Any ideas?