Recorded Programmes Freezing

We have a V6 (powered by TiVo box) and previously had no issues playing recorded programmes.

Two weeks ago we changed our old TV for a new LG Smart TV (web OS22) LQ60 43”

Since then certain recorded programmes freeze on playback, which had never happened before.

Ive undertaken a soft reset (ie turned power supply off and checked all connections). The box is at 86% capacity.

The recordings that freeze all appear to be  from UK TV programmes.

Any help and suggestions would be greatly appreciated.