Can't Allocate Memory Errors

[cur1ydog]

I'm using ClamAV-win32 as an on demand scanner on several versions of Windows computer. I've recently noticed an increase in the number of "Can't allocate memory error" I'm seeing in the log file. On some scans I see in excess of 30,000 of these errors. If I run ClamAV in verbose mode the error at the console looks like this;

LibClamAv Error: fmap cannot map file descriptor 4
LibClamAv Error: Critical: fmap() failed
<filepath & name>: Can't allocate memory error

I've tried various versons of ClamAv-win32 including 0.102.1, 0.103.8, 0.103.10 & 0.103.11. Each give similar results. Oddly, if I target an individual file which has previously produced this error and scan it individually, I do not get another error.