Something doesn’t seem right. The symptoms are of not having enough memory but 16GB should be great.
Are you running SNAP-Desktop or GPT? Have a look at the Tools -> Options -> Performance and see that the settings for the JVM look ok. Are they the default settings? When this happens, is your memory almost at the maximum?
If you had little memory and got this, I would say to check using the file cache for Sentinel-1 reading in the S1TBX options. You could try this.
Also, look at where you’re pulling the data from. Is it a network drive?
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