Have you installed any 'ad-blocker' programs on the machine you are having problems, and also the other machines?.
Do you use Avast, and you do, did the recent Avast update advice that you download Abode Air, and you installed that?.
Huawei P10 review
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New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.