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Can you please let us know the version of CanvasJS being used by you?
Earlier WebKit allowed 448MB of canvas buffer memory whereas now they have dropped it to 224MB. Because of this, there was some memory issue with CanvasJS Charts in the latest iOS. However, we have optimized memory consumption in CanvasJS v2.3 – please check out this release blog for more info. Kindly download the latest version of CanvasJS Charts from our download page.
If the issue still persists, kindly share sample project over Google-Drive or Onedrive, so that we can look into the issue and help you resolve it.