I have a laptop connected to modem by Ethernet. Also, an iPad using wireless and iPhone XR. Several times a day I have to take modem/router (it's a combined unit) off power and plug back in after 15 seconds. After about 1 or 2 minutes iPad or IPhone might start again working or might not. Have to do this several times (sometimes) just to get internet on these two devices. Laptop, because it is connected via Ethernet works fine. This seems to indicate router problem. Will At&T change modem/router and give me two separate units or replace the combined unit. Thanks in advance.