The Masterlink is simply telling you that it's running out of DSP power. DSP limitations are determined by;
(a) Sample rate. 96k or 88.2k will take more DSP power for effects than when working at 44.1k or 48k.
(b) Song length. A longer recording will take more DSP power and memory, because there's more to process.
(c) The type of effect you're using. Some require more power than others.