I've been happily using the Disney+ app on my Samsung TV for the last year without issue.  Over the last month or so though I've found that i have to uninstall then reinstall the app on the TV when i want to use it, otherwise i just get a blue screen, app doesn't even get as far as the Disney+ screen as it's meant to start up.  I uninstall, then re-install through myapps and hey presto it works again (once I re-register the TV with Disney+).  Don't even need to power off the TV - it's just the pain of going throught the install/registration steps each time that is annoying.  

I've tried re-installing the HUB, power off/reset to default of the TV etc. etc.  Nothing makes a difference, only thing that works is deleting the app and re-installing each time i want to use it.  Is this a known problem?  It seems strange that it's just started to happen given I've had no problems previously with the app on this TV.  Btw, my Disney+ account works fine on a newer Samsung TV in another room and via a PS4, mobile phone, laptop etc. etc.  Just this one TV is the problem. 

Samsung TV is 2016 (UE49KU6670) running Tizen 2.4.0 - T-JZMDEUC-1243.2.  Disney+ is running '1.7.3+thanos.05'.