Had a new X240 that gave lots of problems when going to sleep. A factory restore sorted some of the issues, but not all – the system would bluescreen on entering sleep mode. Uninstalling the Intel WiDi software seemed to fix it, and also let the wifi work properly on a home router.
Lenovo laptops freezing issues – WiDi driver
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The fingerprint software seems to be another common culprit – seem to be having this issue on a T440p.