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Hi @Existenz74,
This happens for several reasons: the site might have server issues, expired domain, redirect errors, host errors or there is a communication problem between the target server and your web browser.
Check if your speed is within range. If so, then you may do a restart or clear your web history/cache as a workaround.
PM us with your TPG customer ID/username if the issue recurs.
-Ahra_G
Let us know how it goes, @Existenz74. Also try if same issue happens across all your devices.