How long have the malfunctions been occurring? I see two other sensors with recent malfunction status as well.
Offline malfunctions are a common status which indicates the sensor is having some trouble reaching the panel with signals, and this status has a variety of causes. If you are seeing multiple sensors have intermittent offline status, there are a couple things I would check first:
- How old are the sensors? If they are a few years old, this is a common indication that batteries should be replaced. Lower battery levels can impede signaling before a low battery status would be triggered, especially if the signaling is also impacted by distance or other factors.
- It looks like this is an IQ Panel 2. Check the panel RF antenna. 319.5Mhz sensors use the thin flexible white antenna on the panel which is intended as an external antenna. If it is bunched up in the panel, multiple offline sensors is a very common result. Make sure that antenna is routed into the wall through the back of the panel.
The repeater linked above will not improve the smoke detector signal and I would only recommend it after other potential causes are considered.