Suddenly high latency
First of all: I realise there are a lot of topics regarding latency in MainStage, but excactly for that reason it's very hard to find a topic about the issues i'm experiencing. I really hope someone can help me. (I'm not a native English speaker, I hope I can explain everything clearly).
My setup
Macbook Pro 13" 2010 (C2D 2.4Ghz), 8GB RAM
Mainstage 3.0.3
Saffire Pro 14 (Firewire)
Kurzweil PC3x
Kurzweil PC361
Within MainStage I use some software synths, but most of the time it's just the audio of my two Kurzweil synths going into MainStage and than immediately to the output. One synth is connected via analog jack input, the other one with S/PDIF. I use MainStage to send Midi program changes to my synths and to be able to make 'mixing' presets for every song/preset.
The issue
During my latest gig I suddenly noticed a very heavy input latency while playing my synth. It was near the end of the gig, after playing nearly 2,5 hours. The strange thing is: it was a patch with only 1 audio input routed to the output. No heavy synths running on my macbook, nothing that could possibly cause a high CPU load or fill my memory. Restarting Mainstage solved the issue.
My question is: do you think this is a software issue, related to my Macbook or related to my audio interface? I am thinking about buying a new macbook or a new audio interface, but it only makes sense if i can be sure it fixes the problem.
Any help will be highly appreciated!
MainStage, OS X Mavericks (10.9.2), Saffire Pro 14, Macbook Pro 13" 201