Laser timing head problems

[Jeff Cashmore <cashmo@spec-rx7.org>]

Has anyone else been having intermittent problems with their newer laser
timing heads?  Sorry, I don't know the mfg of ours.  They seem to start
missing starts/finishes when the sun comes out full force.  We're going
to try some (heavy) boxes over both ends to shade them for the next
event but I was wondering if anyone else had a better solution, (a
filter?).

Thanks,
Jeff Cashmore