dappa1
im using focusrite saffire 24dsp since I have loaded platinum I get it from time to time. Im running a 64bit OS with 6gb ram should be stable 1TB Acer desktop computer with intel inside lol
Firewire interface? Are you using a dedicated firewire card with the recommended Texas Instruments chipset (or if you are using the motherboard's firewire does the motherboard have a TI chipset)?
Since it sounds like a prebuilt Acer then they likely did not consider the firewire needs of audio applications such as Sonar and did NOT use the best FW chipset.
Also watch out for "bridging" versus "native" issues when dealing with "daughterboards" (PCI cards). If you invest in a firewire card with a proper TI chipset make sure it uses a PCIe slot... not a legacy PCI slot which will likely be "bridged" which can cause issues like you are describing (and happened to me when trying to use a legacy PCI card and slot on my modern motherboard... which is why I bought a USB interface).
So yeah... if you are using firewire then make sure you have the BEST connection for firewire... which is likely a dedicated PCIe card using an appropriate Texas Instrument chipset (I do not know the exact model number offhand but it is easily found on google because this is an known issue with Firewire).
Cheers.
PS: Also if you are using the Acer installed programs and OS you NEED to do some tweaking. Such as disabling startup programs, removing bloatware, turning ON everything like ports and turning OFF power management crap that will make your computer go to "sleep", etc. Those factory installs are murder for audio programs. The system hardware may be fine but the OS is likely telling it to do all sorts of stupid crap that is disrupting your audio stream thus causing your audio issues.
PPS: I am not a computer tech. I just know what I read and what has solved my own issues.