Do you have an online Fax service you use and are happy with it?
I have had good luck with "FAXzero"...a free (3 pages max.) version and a paid ($1.99) version (up to 25 pages).
Simple & effective and no account sign-up needed. Like you I only need to "FAX" a max. of a couple of times a year (medical/lawyer stuff usually).
https://faxzero.com