minhag - Not to give a divorce (Get) in the month of Iyar

I heard today in Shul that there is a Minhag not to give a divorce in the month of Iyar. What is the source and reason for this Minhag?

Answer

Rama writes, when discussing how to spell the various Hebrew months in a Get (Shulchan Aruch EH 126:7):

אייר, בשני יודי"ן; ואם כתב בחד יו"ד, פסול, אם לא בשעת הדחק. ויש נמנעין ליתן גט באייר, אך במקום הדחק נותנין וכותבין בב' יודי"ן.‏
Iyar is spelled with two Yuds. If one wrote it with one Yud, it is invalid except in pressing circumstances. Some refrain from giving a Get in Iyar [because of the doubt], but if forced to they will give a Get and spell [Iyar] with two Yuds.

The Aruch haShulchan (bio) notes (EH 126:15) the common practice near him was not to refrain from divorcing in the month of Iyar. I'm told that the Beth Din of America does arrange for divorces in the month of Iyar. I'll also note that the Mechaber (EH 126:23) rules unambiguously that Iyar is spelled with two Yuds, so there doesn't seem to be much room to be stringent in this matter for Sefardim.