Over the last couple of days, been seeing some odd behaviour also, worse has been android mobiles reporting no internet. Many timeouts accessing sites, but not consistent. Restarted all internal network devices, and rebooting phones, with little but inconsistent results. This using different ISP - John Lewis on ADSLmax, and opendns.
Using mobile data from the phones (three network) works fine.
Edited by BranH (Wed 23-May-18 10:06:20)