LCD issues

After running the circulator controller for several days now,  after 4-5 hours, sometimes more, sometimes less the LCD seems to start printing garbage characters.  I have tried several different things to get rid of this but have not done so yet.  My latest attempt to get the program to be stable is to add more delay into the program to allow the LCD more time to work.  After reading the LCD manual it seems that this may be an issue and I will keep my fingers crossed however it appears that this may require a better understanding of the LCD and the programming language requiring a bit more studying.   The Arduino and the program are both running correctly in the background and we are enjoying hot showers, the relays come on and shut off at the correct time, all seems to be working fine with the exception of the LCD display, I have switched out the LCD with another of the same brand and type but I think it must just be getting some bad data and not erasing it.  Any suggestions would be helpful.  Sorry about the picture quality, tough to get a good picture of the display.

Garbled display

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