What might cause a virus in a lysogenic cycle to suddenely enter the lytic cycle?

A virus in a lysogenic cycle can suddenly enter the lytic cycle due to various stressors or environmental triggers, such as UV radiation, chemical exposure, or changes in host cell conditions. These factors can activate specific viral genes that initiate the lytic phase, leading to the production of new viral particles and eventual host cell lysis. Additionally, factors like the immune response of the host organism can also prompt the switch from lysogenic to lytic activity.