Lock Screen Character issues

[stpaulibhoy]

Every few days my lock screen numbers etc go like characters and a restart seems to resolve it. Any ideas what is causing it? Didn't do it prior to lollypop update

 

[ColeyLee]

Actually I don't know how to deal with it.I just get one phone with lollipop system yesterday. Hope you can solve it.

 

[stpaulibhoy]

It's really strange. All the numbers seem to turn to characters and box type shapes. Can't post a picture as this forum won't let me as ter