is there a way to test my modem's speed? so i am having fluctuating internet speeds from 300-500mbps, my spectrum plan is 1gbps, the technician told me he ran a speed test from the outside line and was getting close to 1gbps and he ran from my router to his device and was getting around 700mbps, the only thing he couldn’t test was my S33 Modem, i also ran a local in house speed test from my NAS which connects to my switch then hits my router then to my pc and i get 890mbps download and close to 900mbps upload, the only thing i cannot test locally is my s33 modem, is there anyway to run an inhouse test? i also reset the modem to factory settings and the first couple of minutes i had a good speed test of 800+mbps download but after i ran it a second time it went down to 300mbps once again, Note: all these were wired tests, directly connected. any help would be greatly appreciated!