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TVP5150 color subcarrier doesn't lock fter night to day transition

Other Parts Discussed in Thread: TVP5150

Dear Sir,

in our application we are using TVP5150 with a PAL camera on a single analog input.

WE enable (as default) the color kill feature,

The PAL camera connected to it has the feature to go into monochromatic during night (as a lot of analog camera does).

Sometimes in the moring we found the output from the tvp5150 still in balck and white. 

WE are sure that the problem is the tvp 5150 because if we change the reg 3 setting form PAl to NTSC then back to PAL (or auto).. the color is back..

So it seams to be some kind of block in the quadature modulator the recover the chroma...

anyone has any suggestion?