By solid, I'd guess you're talking bridge comb between frames? Usually, when that happens there is too much space between frames. If you are using 10-frame equipment and started with just foundation, you should have 10 frames to minimize bridge comb. If you have 10 frames in there, the frames may just look to be connected as bees will often bridge frames together at the very top of the frames. If so, just pry the frames apart and they should separate. Sometimes during poor or intermittent flow conditions, the bees will sense a shortage of nectar and stop drawing comb but will put a bridge between frames. If that's the case, just scrape the bad parts off and have them do it again. Feeding lots of syrup will keep them so busy that they draw comb well and don't have time to be 'creative'