My fax software is "iffy", i.e., sometimes I'll get a fax, sometimes I get "An error occurred while receiving the fax". What to do?

Have you checked for software upgrades?

To be honest it doesn’t sound any different to my experiences using an actual fax machine.

I usually scan a document and send as an e-mail attachment.

@AlfredaPrufrock , the software update would be to Windows XP. It’s the Windows Fax application.

What I do is better for me. The docs office will fax my report in to me, and, without making a hardcopy, I can fax it out to my other doctors,

I would suggest trying mighty fax. To download the mightyfax file paste this link into your browser url. http://files3.download3000.com/download/abe10106446dcec87c9a42ba54d5f4e7/138/3893/mf32.exe

use this key for the program Name: d/tmg S/N: RKS-2427607
Make sure you use that name and number for mightyfax.