Does anyone ever lose connection although there is indeed a network?

[cyber]

When I am outside central London, for instance in the woods in Wimbledon common, I lose connection. There is a network. I can see the 4G or even 5G icon and the arrows blinking on top right of my screen and the network bars but I am actually offline. To get back online, I have to activate flight mode then deactivate it and then I am back online (for a bit, at least because I have to repeat this procedure quite often). This never happens anywhere else. Has anyone the same problem? How can I avoid it please?

[Sirfoxelot]

I've noticed messages popping up at the bottom of my phone saying "you are now offline" even though I have a good wifi/4G/5G connection, and can see data transfer is taking place

[BandOfBrothers]

Instances like these are difficult To troubleshoot @cyber 

Because it's only happening in one place that makes me lean towards a network issue such as a not spot or fringe coverage.

What is any available network mast checker saying for the postcode your in ?

As a process of elimination can you try your sim card in another phone while in that location ?

[BandOfBrothers]

@Sirfoxelot 

Can you try your sim card in another phone and another sim card in your phone as a process of elimination.

Also your sim card could be the issue and may need replacing via your network via a Sim Swap. 

[cyber]

Thank you BandOfBrothers.

Signalchecker says good coverage,
Ofcom can't find the postcode and
Mastdata says medium.

I kept my old Galaxy S9Plus so I could try my SIM card on it next time I go hiking there

[cyber]

Someone wrote:
'This is likely a network problem, you are losing sight of the cell towers, by going ìnto airplane mode then out you search for the next nearest tower. I would report it to your provider, they will probably update the software'
This makes sense to me. I may contact Vodafone