Intermittent perl errors with cygwin 1.7

[Cygwin]

About once a month I get something like this:

 4 [main] perl 3156 D:\Local\Cygwin\bin\perl.exe: *** fatal error - cygheap
base mismatch detected - 0x6120C6E0/0xD4C6E0.

This problem is probably due to using incompatible versions of the cygwin
DLL. Search for cygwin1.dll using the Windows Start->Find/Search facility
and delete all but the most recent version.  The most recent version
*should* reside in x:\cygwin\bin, where 'x' is the drive on which you have
installed the cygwin distribution.  Rebooting is also suggested if you are
unable to find another cygwin DLL.

There is not another cygwin DLL on my system, and rebooting does in fact fix
it, but that is of course not a solution...

Here is cygcheck perl, and TIA for any suggestions.

Found: D:\Local\Cygwin\bin\perl.exe
D:\Local\Cygwin\bin\perl.exe
  D:\Local\Cygwin\bin\cygperl5_10.dll
    D:\Local\Cygwin\bin\cygcrypt-0.dll
      D:\Local\Cygwin\bin\cygwin1.dll
        C:\Windows\system32\ADVAPI32.DLL
          C:\Windows\system32\msvcrt.dll
            C:\Windows\system32\KERNELBASE.dll
              C:\Windows\system32\ntdll.dll
            C:\Windows\system32\API-MS-Win-Core-Console-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-DateTime-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-Debug-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-ErrorHandling-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-Fibers-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-File-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-Handle-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-Heap-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-Interlocked-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-Localization-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-LibraryLoader-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-Memory-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-Misc-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-NamedPipe-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-ProcessEnvironment-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-ProcessThreads-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-Profile-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-String-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-Synch-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-SysInfo-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-Util-L1-1-0.dll
          C:\Windows\system32\API-MS-WIN-Service-Core-L1-1-0.dll
          C:\Windows\system32\API-MS-WIN-Service-winsvc-L1-1-0.dll
          C:\Windows\system32\API-MS-WIN-Service-Management-L1-1-0.dll
          C:\Windows\system32\API-MS-WIN-Service-Management-L2-1-0.dll
          C:\Windows\system32\API-MS-Win-Core-LocalRegistry-L1-1-0.dll
          C:\Windows\system32\API-MS-Win-Security-Base-L1-1-0.dll
          C:\Windows\system32\KERNEL32.dll
            C:\Windows\system32\API-MS-Win-Core-RtlSupport-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-IO-L1-1-0.dll
            C:\Windows\system32\API-MS-Win-Core-ThreadPool-L1-1-0.dll
          C:\Windows\system32\RPCRT4.dll
            C:\Windows\system32\API-MS-Win-Core-DelayLoad-L1-1-0.dll
    D:\Local\Cygwin\bin\cyggcc_s-1.dll
    D:\Local\Cygwin\bin\cygssp-0.dll 



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