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VD and HD pins

Having an issue with small percentage of our product that uses the davinci chip, TMS320DM6446AZWT, where the chip stops streaming video. We have a TI decoder chip that encodes analog video into 656 video with embedded syncs. I noticed that our design leaves the HSYNC and VSYNC on the davinci chip floating. Obviously in our version we don't use these pins but was wondering if leaving them floating could cause an issue like we see?