The “Checking your browser before you access eBay.” occurs on a daily basis on my GS. I reported it numerous times and it was pretty much decided to be the age of Safari or the OS. I run 12.7.6 and can’t update because of the age of my computer. I just refresh the Token and the problem goes away for 24 hours. The worst part about it is the Captcha pictures you have to choose that add 2 or 3 clicks to the process.