Have you looked at the previous footage prior to making your new recording? It could be that you have played or fast forwarded the tape a few seconds beyond what you had previously recorded. Thus creating a 'gap' of unrecorded tape.
My Sony Camcorder shows a blue screen when playing a blank section of tape.
Either pause the camera actually over the last few seconds of picture and then go into record. Or your Camcorder may, like mine, have a 'tape end search' button. This will automatically 'park' the record head on the last frame of previously recorded material, so that when you record your next footage there will be no 'blue' gap. Hope this helps