Force Close is a safety mechanism in LN. If something is not right with a HTLC, a node will initiate a FC to protect funds. In a high fees environment that FC will look to settle in next block so you or the other node will incur the closing and sweeping cost. It is a bit complicated topic but part of running a routing node.

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So ideally you connect to channels that are reliable

Yes. But, you can still get a FC situation. It is always good to open channels with folks you know to be active and reliable. For various reasons. That is how we started Plebnet. Lightning Node running is a team sport!