For the past few months or so my internet service is very slow. Have a PS4 hardwired into the router/modem that was provided by Comcast for the gig service. PS4 lags very bad and cannot have another device connected to WiFi at the same time let alone multiple devices. Speed tests on the PS4 show 30-40mbps at best. Speed tests on iPhone X show 120mbps at best. Have called Comcast multiple times and there saying everything is fine from there end. Took about 4 phone calls to get a tech out to my house only to be there for 10 minutes saying everything is fine and that no device can get up to 900+ mbps. Tech also checked modem saying it is fine and still the same problem. Modem is in the middle of the house and can barely watch Netflix from iPad in the bedroom 20 feet away. I am paying over $100 a month to have slow internet. Can I get some help or some kind of advice on what to do next?