Apple mail app not always loading content

I'm using Monterey 12.6 on my iMac. Sometimes mail content doesn't load on some incoming emails. It's not consistent; sometimes it's fine, other times the content doesn't load. Sometimes if I just click on another email, then go back to the original, the content loads...sometimes I have to try a few times. I looked at the connection doctor and see that my sky/Yahoo account isn't listed. Is that part of the problem? If so I have no idea what to do about it. This is a problem that has developed fairly recently - I'm not sure if it developed when I installed 1.6, or whether it's developed more recently than that. Simple answer please ...I'm afraid that when I read helpful contributors suggestions I'm lost after the first line. I'm over 70 and allowed to be IT illiterate!