Greetings,
I created a whole thread about tips and bugs with the New Spectrum Guide. First I have heard though of poor screen resolution and picture quality. I still have my Cisco 9865. Here's the Spectrum Guide thread for your consideration:
Update- You should get a tech out to assess your signals and drop line, as well as your tap. The problems that you are describing are more signal and line related. Avoid resetting any boxes, modems, or routers for six hours prior to your service call so that the error codes don't get reset to zero. The tech needs to take a signal reading and check out your lines. Ask him to check your resolution settings on the box as well.
No clock on the box is a result of moving to cloud-based services. You can try to get a box with a clock, but you might have to go back to a two tuner DVR if you do that. The six-tuner boxes are becoming rarer and rarer. The World Boxes are four tuners.
Satch