The Quick Service Restaurant (QSR) industry faces a number of challenges, including:

1. Competition: The QSR industry is highly competitive, with many players vying for market share. QSRs must differentiate themselves in order to stand out and attract customers.

2. Consumer preferences: Consumer preferences are constantly changing, and QSRs must keep pace with evolving trends in order to remain relevant and appealing to customers.

3. Food quality and safety: QSRs must ensure that their food is of high quality and safe to consume, as food safety incidents can damage a brand's reputation and drive away customers.

4. Cost control: QSRs must manage costs effectively in order to remain profitable, while also offering affordable prices to customers. This can be challenging in a highly competitive market where margins are thin.

5. Technology adoption: The QSR industry is rapidly adopting new technologies, such as digital ordering systems, mobile ordering apps, and kitchen automation systems. QSRs must invest in these technologies in order to remain competitive and meet the needs of customers.

6. Staffing and training: QSRs must attract and retain skilled and motivated staff, as well as invest in training and development programs in order to maintain high levels of customer service.

7. Supply chain management: QSRs must manage their supply chain effectively in order to ensure that food is delivered to stores on time, in good condition, and at the right price.

8. Sustainability: The QSR industry is under increasing pressure to adopt more sustainable practices, such as reducing food waste, using renewable energy, and sourcing ingredients from sustainable sources.

By addressing these challenges, QSRs can build successful and sustainable businesses that meet the changing needs and preferences of customers. This may involve investing in technology and innovation, offering high-quality food and customer service, and adapting to changing trends and regulations.