This question already has the relevant info: Laptop crashes while trying to compute/plot inverse solution. I suspect my forward model is too intricate. How to address?
…but you say you’re using ico-4 and it’s crashing? I suspect it’s not the forward model that is the problem. Check your script to see if you’re keeping around unneeded variables. For example, don’t load raw data for all subjects all at once; load one subj at a time, process them all the way through, then load the next subj.
If you can’t prevent the crash that way, please post the script and the full traceback and the output of mne.sys_info()