If the Ethernet Cable is CAT5, I doubt you're running enough length in your house to cause problems. However, if it is ran through/by anything that gives up an electromagnet field, it could cause connections issues.
A: Upgrade your wireless equipment by either purchasing a new NIC, Wifi Range Extenders (This is supposedly shotty, never personally used one), or hardwire your laptop the the network.
Also, what software/configuration are you using to cast your movies? Some software may be causing the issue.
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