Smarty data drops out every 10-20 minutes for 10-30seconds...?

This seems to be occurring since the merger with Vodaphone.  We use Smarty + 5g router for our home internet, and it was rock solid up until a month or two ago.

Now, every 10-20 minutes, the data connection drops for 10-30 seconds, making WhatsApp video calls, Teams meetings, etc incredibly frustrating.

The network status has shown "we're fixing some issues in your area" for over a month (SA19 7LW).

Any idea when (if?) this issue will be fixed?