I don't want to keep having to sign in. 'Keep me signed in' facility would be great.
It is implicit in my feedback.

There’s a “Keep me signed in” checkbox when you log in, just below the password field. If you still find that the issue is happening, please see this help page for troubleshooting:
https://help.yahoo.com/kb/new-mail/fix-problems-mail-sln28075.html?impressions=true
Thank you!
Mail Support
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np commented
i just told you you idiots,but i'll tell yous again.
"Stop making me sign in every **** time i want to check my email you jerks" -
peter Willmington commented
I don't like having to log in every time I login to Yahoo Mail. It doesn't even remember me when I use Yahoo mail twice in one session.
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Brian Slater commented
Good idea!
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Kay Smith commented
Looks like Yahoo doesn't listen to any of these complaints. Hate to switch to GMAIL!!!