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This is the promised update on connectivity testing:
Phone is Samsung S22 Ultra with A13. I had 3 sensors connected to LM4: WS07, WS08 and a heart rate chest strap TICKR 7106. The TICKR stayed connected all the time and data was received with no interruption (checked the graph after the trip). I have used the TICKR several times and connectivity is always rock solid.

However WS07 and WS08 have connectivity issues. First I did several tests with screen on for >30 minutes, LM4 in the foreground and locked, and didn't touch the screen. When I checked the phone after >30 minutes, the LM4 sensor menu said the WS07/WS08 were connected, but no data received. I had to either turn the screen off and then on again (as experienced by another user in this thread) or tap Disconnect followed by Connect to reestablish data transfer.

Then I did several tests with screen off. Same issues. Each time I turned the screen on, LM4 showed no temperature data initially. Some times after 3-5 seconds, temperature was shown again, but some times I had to tap Disconnect/Connect to reestablish data transfer.

At home I tested WS07/WS08 with the SensorBlue app with screen on all the time. After exactly 30 minutes the app stopped showing data. By putting the app into background and then back into foreground, data transfer was reestablished. If I did this operation every 25 minutes while data transfer was still ok, another 30 minutes of operation was achieved.

Conclusion: It seems to be a 30 minutes timeout in the sensors themselves. Confirming what another user experienced and posted earlier. With LM4 turning the screen off and on before the 30 minute timeout is a workaround. This gives you another 30 minutes each time. Must be some sort of background communication with the sensor when the screen is turned on again. If LM4 could send some sort of command to the sensor every 25 minutes or more often, connection should be stable. 

It is true that SensorBlue on their home page specifies the CR2477 battery. By checking more on AliExpress this morning, I just found out that Oria has two versions of this WS08, one with the original case size of 50x50mm, sensor opening in the front and CR2477 battery, and one with increased case size 58x58mm, sensor opening in the back and 2xAAA batteries. Both versions are sold on AliExpress AMIR & ORIA Store.
But both obviously uses the WS08 hardware design inside, since the paper user guide that came with the 2xAAA version I received yesterday, has the text "SensorBlue WS08" on it. ALso on the back of the device the label shows "WS08D".

Today I will be on a 4 hour skiing trip and will bring both the WS07 and WS08 with me connected to LM4 to test connectivity. I will post an update on the connectivity when I am back this evening.

Good news: I bought both the temperature/humidity sensors SensorBlue WS07 and WS08 from AliExpress. They both connected to LocusMap using the entry "Thermometer WS07" with no issues. I used the Locus Dashboard editor and created a map overlay showing temperature/humidity directly on the map. I tested both sensors with two other sensors I have, and both WS07 and WS08 are accurate and within spec (temp +/-0.5degC, humidity +/-5RH). Both are excellent devices. The WS08 has a display and runs on standard 2xAAA batteries, while WS07 has no display and requires the coin cell battery CR2477. On AliExpress WS07 and WS08 appear under the names Oria and Oria Upgrade respectively. The user manual that comes with the package actually uses the name "SensorBlue" on both devices, confirming they are SensorBlue devices.

AAhh - now I got it! Thank you all. I first didn't understand what you ment with "Hamburger Menu" - finally my brain understood. Good expression! I realized I haven't been in "Expert" mode with LM4. Anyway - I changed the text size and most important - the Background color - for the distance rings. The background color made a huge improvement to visibility.

By the way, Menion: LM4 is amazing! You probably don't remember me, but we had very good communication many years ago about features in Locus Map Classic. LM4 is really worth the annual fee. Thank you so much to you and your team!!