Each and every general insurance policy (homeowners, auto, workers comp, general liability, fire, etc.) sold and purchased by consumers and businesses is typically a one year contract. At the end of the contract, both the insurance company and the purchaser are free to stop doing business with each other, or continue on if both can agree to a price that both are willing to accept. No one is getting married for life here for better or worse.
Executives at insurance companies develop strategies each year for business they want to continue writing, the asking price for those policies and what business they no longer want at any price (or perhaps at a prohibitively high price). The fact that hurricanes did not hit any of their insureds in State X for the past ten or twenty years does not mean they want to continue writing business in State X. If John Doe has had no claims in the past decade, that does not mean that the insurer wants to continue that relationship with Mr. Doe.
Other considerations about staff and their cost of catastrophe or excess reinsurance protection (in case you do not know, your insurer purchases insurance on its claims from insurers to the insurance industry called reinsurance companies). It could be that their net worth (or policy holder's surplus in insurance accounting speak) has dropped and their ability to continue writing policies is restricted by the insurance regulators in each state who are attempting to make sure the companies do not over extend themselves so that there will be sufficient funds to pay future claims. This is done to protect the purchasers of insurance.
Insurance is a complicated business, and yes there have been many, many insurance companies that have gone bankrupt over the past several decades. I worked for many years at two companies that are no longer in business because they could not operate profitably.