I don’t think that it’s normal. I rarely see such problems, so to me this suggests some sort of network issue. Are you connecting wirelessly? If so, try an Ethernet cable connection instead, to see what happens, even if this is a temporary thing. If you are using power line adapters, these can cause problems — I speak from experience here, because when I used them before going for Ethernet cabling, Netflix was the only app. that would never stream consistently, regardless of platform. You could try an external device, such a Roku box, or ATV. The problem could be something to do with your TV if you’re using the embedded app.
These issues are never easy to troubleshoot and take time to resolve — again, I speak from experience. For me, connecting via Ethernet cabling, directly from router to devices (via a switch at the a/v end of things) eliminated all of my connectivity issues. Power line devices worked well, Netflix aside; streaming via wi-fi did work, but was glitchy.
The main hassle with direct Ethernet cabling is routing the cabling, and there are limitations on cable lengths, but flat, low profile cables are easy to run under carpets, etc. Good quality cat6e cabling is cheap, the chore is the time the installation will take, especially if it has to be wife/partner friendly and involves drilling holes in walls.
You need to investigate this in order to solve this if it bothers you. If not, just live with it. I know what I’d do — this sort of thing would drive me nuts (it did!).
Clem