Sounds like it’s filling its buffer slower than it can play it, so basically you’re buffering (the pauses) and then playing which is emptying the buffer.
Which format are your videos in? It may be that your files are in a format that the Philips natively supports, but the Samsung doesn’t and has to do a conversion on the fly perhaps (which will slow things down). I would check what formats the Samsung supports directly, and maybe also try converting your video file to another commonly supported format (e.g. MP4) and see if that helps.
Could also be that the buffer is bigger in the Philips than the Samsung, or some hardware difference like USB2 vs USB3 ports on the televisions themselves.
