It is hard to advise w/o seeing the code. Please post your code
Select project in the Explorer window. Then File->Create project bundle->Minimal. In created *.zip file delete Generated_files folder to reduce size of the archive.
The simptoms you mentioned indicate that DMA pointer moves beyond allocated array space and basically wanders across RAM.
I looked at your project.
You need to try to use the DMA wizard to configure your DMA, and transfer into an Array of data (which could be called ADC_DATA) rather than into CYDEV_SRAM_BASE.
The software Heap exists at the beginning of SRAM (which is CYDEV_SRAM_BASE), among other things. Using a destination array variable will fix some of this problem and get you farther down the road.