suspicious
Using Yahoo with WiFi connection at WiFi fluctuations the account gets closed automatically and time after time the suspicious activity error prevents return to normal operation. The amount of new passwords necessary is hugh.
Other mail providers like gmail and hotmail etcetera do not have that problem and WiFi mailing is supple. Yahoo error help does not include this problem nor does an option appear where you can lodge the issue for the particular account itself.
Please reduce the Yahoo connecting sensitivity for WiFi fluctuations so time at the keyboard can be spend mailing instead of ever procedural suspicious activity hopping to get a mail out.

We’d like to look more into this, please send us a DM on Twitter at @YahooCare, containing your Yahoo ID and a screenshot of your experience.
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Arie commented
The WiFi sensitivity has diminished but still present with the necessity to go through the procedure of new password, suspicious activity etcetera.
Another issue has arisen from the WiFi sensitivity being the contacts not called-up when partially inserted although they are stored in contacts.
Again these issues do not appear with other providers so please bring the Yahoo connectivity up to normal.