I have a 20mbit wisp out here at my home. We have almost flawless streaming regularly. 2-3 people plus myself running online games daily and often at the same times. However while these things work with no hiccups to speak of when my wife tries to run Disney+ which is on the smart tv it just fails. The Disney+ client loses connection regularly, the stream buffers a ton. The rest of us have no problems. I never get lag spikes on my games. I ask my folks about their streaming, no buffering or anything pretty much ever?

I'm just lost. I know 20mbit isn't much these days but for now the best available where I live. Why does everything work fine except the Disney+ whether or not anyone else is really streaming or anything?

Disney+ is a paid subscription service, right?

Given that you've got plenty of evidence the issue is not your connection, you should be talking to Disney and/or the company you pay that money to.

Is your smart TV 4K and is your wife trying to watch 4K content? I don't know how much content they currently offer in 4K but that would be something specific to Disney+

Is the TV connected via WiFi and if so is it using 5GHz wireless? Although 2.4GHz is 54MB/s it would help distribute the bandwidth "load" depending on your WiFi capabilities.

According to Disney+ you need a min of 25MB to watch 4K and it will automatically stream 4K if detected and if the source is 4K. You should be able to set the playback to always using lower quality.

If no one is playing games or doing anything else on the Internet does Disney+ work ok? HD video streaming needs only 5MB/s AFAIK so in theory the games if they need HD would be ok but with 3-4 people online at the same time would be pushing the limits on your total bandwidth.

Besides diagnostics suggested, also plug in an Ethernet cable to see if the problem persists with wired.

I've seen start up delays with Disney+, both on my phone or on the smart TV, but not persistent.

Sorry just got back. I only just found out it's apparently just this tv. No 4k btw. I do appreciate the replies though. But will test just the same.

It would help others searching for a similar problem/solution if you shared the details of this particular setup?