The sun, brings daytime, there is more activity and opportunities for various activity causing interference. Randomly, from time-to-time I loose a channel, often briefly… for no apparent reason.
To go from something to nothing for every channel? This does seem extreme. There are occasional post from users discovering something specific causing interference. Here’s an obscure example:
several users figure out the hard way too much amplification isn’t good.
After some time I discovered, after a lightening strike on the power line transformer, the power supply for my landscape lights screwed up one single channel.