Problem with A77 and external flash

Today I shot about 200 flash images at a model train show with my A77 with the HLV43AM mounted on the hot shoe then it stopped recognizing that the HVL43AM was mounted. I was able to finish the shoot but only wirelessly.

I tried removing and replacing the 43 several times, I also tried my HVL42AM with the same results.

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Sarge
A77, A700 8mm Bower, 50mm 1.7, 35-70 F4, 90mm Tamron, 18-250 Sigma, 70-200 Sigma & 50-500 Bigma
Toys - Asus Transformer Android 4.0.3 tablet & Colorspace UDMA 500 gb
Albums at www.sony-snapper.com