Firmware 061.121.225.27200 is 6 versions newer than what you have on yours.
Beyond that, any troubleshooting by a remote person will be pretty hard unless you can explain more than "Won't always scan to email"
For instance, does it work the first few times and then stop, primarily when you attempt to send 3 or more emails within a 5 minutes span? If so, it is likely a filter, especially if using gmail, in which case you should be able to delete out the "Header/Footer/Message body in the email (especially the "Scanned from a Xerox blah blah blah" part) and change the file name to something else, preferably something with codes that will make a new name for every scan ala:
Otherwise the mail server sees emails being sent with exactly the same sender, subject line, message body, footer info and attachment name for every email, which it flags as spam and stops working for around 20 minutes, or until a connection is broken to the device (reboots)
Next up, we have SHA-2 encryption which is being added to most mail servers, and will be added to all the clusters of servers within Gmail and Office365 by January 31st this year. The firmware you currently are running does not support SHA-2, so , for example, if you send through smtp.gmail.com it will work sometimes but not others, it just depends on which smtp server it authenticates against, if at the time of this posting it was to reach out to smtp.gmail.com and get assigned to the one at IP 72.125.29.108 it won't work, but if it hits 74.125.202.108 it could. The only way to know for sure is to do a wireshark trace and compare a good scan with a bad scan, if this is the issue, the firmware update will fix it.
But this is all shot-in-the-dark responses because I have no idea what your symptoms are when it fails, it might be giving login errors (or Connection errors, or no error at all but you don't get the email (Usually the spam thing) or you get it but many hours later (Spam thing always)