If your smart trainer encounters a locking problem, the first thing to check is your exercise mode. If you are using ERG mode, it is important to understand this mode and its working principle.
ERG mode description:
In ERG mode, regardless of the cadence or speed, the smart trainer will attempt to keep you at the target power. If your cadence slows down, the smart trainer will increase resistance to maintain target strength. Reducing your cadence too much will force the smart trainer to exert more resistance than you step on, which is called "ERG mode locking" (also known as "death spiral") and is the most common reason for the smart trainer locking. As the cadence increases, the smart trainer will reduce resistance to avoid exceeding the power target. With a fast enough cadence, you will feel almost no resistance.
To avoid ERG mode locking:
To avoid locking during cycling in ERG mode, please focus on maintaining a stable and consistent cadence throughout the entire cycling process. Please remember to smoothly increase and decrease the cadence between interval changes, allowing the smart trainer to adjust the resistance to meet your power target. Slightly increasing your cadence before the change, may also help to "attack" the power target sharply increase (especially during intervals). In addition, many third-party applications adjust exercise power targets based on user settings for exercises.