I bought a Ring doorbell 2nd Gen recently when they were on offer. I am finding that the wi-fi signal is consistently poor or very poor in the app. I suspect this is also why the video quality is poor and grainy. I've seen clips from other people's Rings and the quality on them is crystal clear.
Is there any solution other than moving the router closer to the Ring doorbell? I have my router connected to a Virgin super hub in an upstairs bedroom. The router needs to be wired to the super hub with an ethernet cable, so options for moving it closer are limited. Might have to send the Ring back unless there is a way to boost the signal.