Yes, you should have a firewall on your home network prevent hackers from getting in your network and causing damage to your devices or files. You should be able to put up a firewall with your Windows computer on the home menu>control panel>Firewall and that should work.
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I would say material costs and hiring costs, idk if that helps or not
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It could be because you where hack. Or there was something wrong with the site that stopped it from saying why it stopped.
First, check that your drivers are up to date. The lag could be caused by outdated drivers that are essential in running your system smoothly. New updates will fix bugs, known errors and will make programs work better and faster. Next, run your anti-virus software to check if malware, spyware, and adware that could be putting your computer at risk by installing hidden files, downloading stuff from the internet and uploading sensitive information from your computer. These unauthorized activities could be eating up your RAM in the background without you knowing and thus making your computer run slowly.