I sent PCCW another email re the problem during lightning; a tech support guy phoned me, said he’d asked someone to check the server (which – I think – relays transmission to my home).
Just phoned by a technician, and he has changed my server; so it will be interesting to see if this helps to reduce or halt my intermittent server troubles during nearby thunderstorms.
Yikes! – checking HK Observatory site to see if thunderstorms likely in next few days, I see there’s a thunderstorm warning, and looks like there are major storms just north of HK, including north of Lantau, mainly moving east but edging southwards too. So, could very soon have chance to see if new server helps.