Hi Verdre,

Thanks for above log;

1. Could you confirm above issue is seen only in connected state:
[a] say, you keep scanning for AP but do not connect to any AP;
[b] along with #[a], you do suspend and resume; 
[c] after a specific time(you could try different duration, based on how fast 
you use to see the issue) you try to connect to any AP;
[d] do we see #[c] pass(could connect) or fail; if it does pass, then would it 
fail after few more suspend and resume;

2. could you kindly try the same use case by disabling power_save(if not
tried already); You could just use below command before connection:

iw dev mlan0 set power_save off

Let me know, if am not clear;

Regards,
Ganapathi

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https://bugs.launchpad.net/bugs/1730924

Title:
  Wifi does down "crash" in Surface Pro 4

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