Hi @Muirchu,
Thanks for reaching us here in the Roku Community and welcome!
We appreciate your report about these missing letters and we'd like to see more on what's going on here.
We'd like to know when you started seeing it and how long have you been experiencing this issue.
In addition, does a system restart (from Settings>>System>>About) cover it, or does it come back right after the restart?
Share with us a bit more information about this so that we can further assist you.
Regards,
Rey
ERey.
Roku Community Moderator