Why does half of my inbox suddenly move to SPAM?

[Eddy]

In the last few days, I had it twice that when I log into my inbox, half of my emails have disappeared. I then checked in my SPAM folder and they do appear there. Strangely amongst them are several with senders and on topics that I use a lot and are certainly not Spam. Some of these had follow-up emails of a later date and had not moved to Spam...
When this first happened over the weekend, I just moved them back using "not spam" and hoped that would be it. But this evening I had exactly the same problem with exactly the same emails.
Anyone any idea what could have gone wrong?

[Trooper63]

This is a problem only Yahoo can resolve...if the following link does not help

http://help.yahoo.com/kb/index?page=cont...D_MAIL_ML.

If you are in the Newest format you will have click on SETTINGS instead of Mail Options referred to in the above link
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In addition to being able to contact a yahoo rep in the links below
you will be able to solve MANY of your problems on this site. .
http://help.yahoo.com/l/us/yahoo/mail/ya...index.html
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You can submit various problems through this link.. http://help.yahoo.com/l/us/yahoo/ysm/ts/…

In addition, this is one of the best links to contact Yahoo
http://io.help.yahoo.com/contact/index?y…
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You can use this link for options to contact them
which includes EMAILING a Customer Care Rep
http://bit.ly/YahooSupportHelp
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You can now contact Customer Care on Twitter
Once you start and tweet your questions you can access them
and see if they have been answered by clicking on "ME" when
you are on the site.
https://twitter.com/YahooCare
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And you can contact them on Facebook.
https://www.facebook.com/YahooCustomerCare

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Yahoo customer service telephone no's
800-318-0612
866-562-7219
408-349-3300.
855-837-9965 ...

Customer care for UK & Ireland..
http://help.yahoo.com/l/uk/yahoo/mail/or...
Yahoo customer service telephone no 0870-352-2000