A few weeks ago I turned on my Sony HT-XT3 sound base for the first time in a couple of months, and was offered a software update which, with hindsight rather stupidly, I accepted.

Since then the device has been exhibiting the following problems:

1. Unless it is switched on shortly after having been connected to a power socket, it takes a very long time to start working, pending which the front panel repeatedly states 'Please Wait'.

2. It is only possible to access the Home screen shortly after the unit has been connected to a power socket and switched on for the first time thereafter, and when there is no wired ethernet connection and no wireless signal. However, when I do succeed in displaying the Home screen, I can only change the initially selected icon once, before the display freezes. It is therefore impossible to perform a factory reset via Setup, or to perform an update using an image written to a USB drive. I have confirmed that the remote control is working using the camera in my phone, and I have also changed the remote control batteries.

Oddly the unit does start working in the sense of producing sound a few minutes after the TV (a Sony KD-43XD8305) is switched on, but the sound cannot be altered.

I have tried to reach the home screen and thence perform a factory reset using three different TVs, and using various configurations, for example not using the HDMI port that supports ARC, but to no avail.

The unit is about 4 and a half years old but should not fail at this age, and certainly not because of a Sony software update.

Can anyone advise on whether this problem is fixable, and if so how please?

If there is not a straightforward fix, can anyone from Sony offer a replacement or a nil-cost repair?

As things stand I'm feeling very disappointed and frustrated, and will never buy a Sony product again!

TIA.