Sharp drop off in lux and solar radiation without clouds

There was a sudden sharp drop off of lux and solar radiation. Sky is clear. Here are the readings:
11:50am, lux 133651, solar radiation 1114
11:55am, lux 121579, solar radiation 1013
12:00pm, lux 64613, solar radiation 538
12:05pm, lux 121914, solar radiation 1048
12:10pm, lux 138001, solar radiation 1150
Is this due to a glitch in the system or ?. All other readings were normal.

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