I had this problem with AmazonPrime last night. I tried reinstalling the app. but that did not work. I had had this problem a few months ago with Netflix on an older SAMSUNG SmartTV and remedied the problem by changing the DNS (to 184.108.40.206, I think). The current TV is a QN82Q6FN. The slim user manual suggest changing the DNS to 220.127.116.11 for such problems. Settings > General > Network > Network Status > IP settings > DNS Setting > Enter Manually > DNS server > enter 18.104.22.168 > OK. My Internet Provider is Spectrum, but they seem to be in the dark with this problem. Strangely, when I had had the problem with Netflix, it affected the SmartTV, but not the Netflix on the SAMSUNG Blu-ray player. Last night's AmazonPrime problem was on both the TV and the SAMSUNG 4k player. The computer was not affected in both cases. This morning (April 27, 2019) AmazonPrime came right up.
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