Random Text In Serial Read?

im reading a serial com port (Ardunio FTDI presented as a com anyway). It works fine for a few seconds then randomly I get random text, Ive tried a few different settings but there dosnt seam to be a specific trigger for the randomness.Ive read a few notes about a known buffer overflow issue and checked it in terminal where it's fine. This is my first return to VB in 10? years so im more then alittle rusty but this has me stumped,

Private Sub Timer2_Tick(sender As System.Object, e As System.EventArgs)
Handles Timer2.Tick
Dim LineOfText As String[code].....