Have had this issue for months already, good to see that in classic PA fashion this bug is still going strong /s. Just posting here so others can chime in when they have the same issue.

Can confirm happens quite a bit for me as well. Although I found a way to make it happen less. On loading screen I initiate speed test that seems to keep the connection active for longer so reducing total number of the issue. However can confirm this is Sea server only problem.