I'm reporting a glitch
This is not an 'idea'; I just can't find the proper channel to report a glitch (so maybe this is an idea for improvement-make it easier to/clearer how to report a bug).
For the last few days 'search' in Yahoo mail has been functioning poorly. When I enter a keyword I'll get somewhere between 2 to 8 results from roughly the past 2 months. Below that will be the blue ring going around in circles indicating that Yahoo mail's search program/algorithm is still looking for earlier messages containing my keyword...but nothing ever happens - no older messages ever appear and the blue ring just keeps circling. Just now I searched for messages containing 'Delta'. Yahoo mail returned 7 emails dating back to June 25th. I've left the window open for at least 15 minutes now and nothing has changed.
Over the same time period I've noticed that search results sometimes, but not always) contain messages from my 'Trash' folder, but sometimes not (and previously never did unless I specifically asked it to search in the 'Trash' folder.
I'm using the most up to date Chrome browser.
...and it's not 100% of the time, it's intermittent.