The Metal Performance Shaders operations encoded on it may not have completed.

Tensorflow metal was working on my Power Mac Mac M3 until yesterday. Then my code started freezing. I ran the test script from https://developer.apple.com/metal/tensorflow-plugin/ and it now crashes - this used to work fine, but all of a sudden it does not. The results are shown below. Has anyone seen anything like this? Could this be a hardware problem?

MacBook-Pro-3: carl$ python mac_tensorflow_test.py 
Epoch 1/5
  1/782 [..............................] - ETA: 51:53 - loss: 6.0044 - accuracy: 0.0312Error: command buffer exited with error status.
	The Metal Performance Shaders operations encoded on it may not have completed.
	Error: 
	(null)
	Ignored (for causing prior/excessive GPU errors) (00000004:kIOGPUCommandBufferCallbackErrorSubmissionsIgnored)
	<AGXG15XFamilyCommandBuffer: 0x1172515e0>
    label = <none> 
    device = <AGXG15SDevice: 0x1588e6000>
        name = Apple M3 Pro 
    commandQueue = <AGXG15XFamilyCommandQueue: 0x17427e400>
        label = <none> 
        device = <AGXG15SDevice: 0x1588e6000>
            name = Apple M3 Pro 
    retainedReferences = 1
Error: command buffer exited with error status.
	The Metal Performance Shaders operations encoded on it may not have completed.
	Error: 
	(null)
	Ignored (for causing prior/excessive GPU errors) (00000004:kIOGPUCommandBufferCallbackErrorSubmissionsIgnored)
	<AGXG15XFamilyCommandBuffer: 0x117257b40>
    label = <none> 
    device = <AGXG15SDevice: 0x1588e6000>
        name = Apple M3 Pro 
    commandQueue = <AGXG15XFamilyCommandQueue: 0x17427e400>
        label = <none> 
        device = <AGXG15SDevice: 0x1588e6000>
            name = Apple M3 Pro 
    retainedReferences = 1

Many more rows of similar printouts follow.