For the last few weeks, when I visit https://gerrit.wikimedia.org from my laptop, I get a 403 Forbidden. If I visit from my mobile via 4G or wifi, I can access. However, if I visit from my laptop via 4G or wifi, I can't access. If I clear my cookies or visit incognito, I get the same 403. So it seems related to my laptop rather than my account or ip.
However, some days ago I got two bug reports regarding a gadget I maintain. I was able to reproduce the bug and it seems the cause is related to this 403 (basically, the gadget loads the latest message translations directly from Gerrit, but gets the 403 instead), and one of the users confirmed they are getting the 403 when visiting Gerrit. So it seems I'm not the only one with this issue.