We had a fun one ...

We had a STK Silo and we were getting "random" late afternoon barcode read 
error from the camera inside the Silo,  CE would be called, Could find nothing 
wrong. This went on for about  month or so, Not every day but a few times a 
week, 

It stumped everyone, So the next time it happened, I send someone from 
operations up to "Look" around just after it happened. 

Turned out the setting sun was bouncing off the glass office building next door 
thru the window into the datacenter (We used to move equipment in/out of the 
data center 3rd floor location) into the little 4x6" viewing window into the 
silo.  And for a few minutes it "Blinded" the camera looking at the tape 
barcodes where the sun's rays went thru. 

Field Fix ... We taped a manila folder over the little viewing window, and had 
facilities management install a blinds on the window. 

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