This takes a small amount of time and money invested regularly to avoid large repair bills all at once and will often end up saving money. This is especially a danger for high revving high performance chainsaws as they are usually air cooled and used in bad conditions.
Warning signs that your chainsaw may be acting up are difficult to start. The most common problem that could be a fuel issue or a bad spark plug. A loss of power could be down to a clogged exhaust or a dirty filter. Overheating and chattering chains when using a chainsaw could indicate that its teeth need sharpening.
Read the Manual
The best way to avoid problems is reading the manual so you know all the serviceable and high maintenance parts. This will also give you a guide for optimal conditions to use your chainsaw. If you cant find this data a local supplier could always take a look for you and give you the info you need.