I am using Opera browser on Android on a Samsung Galaxy with an ad blocker enabled. I don't have the same issue on the same device if I use Chrome but then I find the ads make it very annoying with all the pop ups etc.
I’ve seen it mentioned a few times, it’s been suggested it has been since a device update? Would be interested to know which device, browser, even the size of the device.
All these little things help to narrow down the problem and I can point the techies towards the issue as it’s always something specific to the device/browser.
For example, 90% of my time on the forum is on my mobile, a normal iPhone XR normal safari, no plugins or add ons
Samsung Galaxy S21
Google Chrome with Adblocker enabled