Hello Scrat69,
I understand you have some connectivity issues with the Intel® WiFi Link 5100.
In this scenario we recommend checking the settings for the wireless adapter and the access point as explained in the following articles:
How to access and configure advanced Wi-Fi adapter settings
http://www.intel.com/support/wireless/wlan/sb/CS-025393.htm
What are the recommended settings for 802.11n connectivity?
http://www.intel.com/support/wireless/sb/CS-030709.htm
How do I improve my 802.11n wireless performance?
http://www.intel.com/support/wireless/wlan/4965agn/sb/CS-028449.htm
Possible interference by other wireless devices may impact 802.11n performance
http://www.intel.com/support/wireless/wlan/sb/CS-031509.htm
Access Point (AP) firmware updates may resolve wireless network issues
http://www.intel.com/support/wireless/wlan/sb/CS-006321.htm
You may also consider updating the Intel® wireless driver:
https://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=22495
I hope the suggestions help.