Weird OneWire bus problem
If you were trying to wire your bus in parasitic mode, here is what I am using:

OneWire Bus in parasitic mode:

+------------+     +5v            +---------+     +---------+
|    MCU     |      |             | DS18b20 |     | DS18b20 |
|            |  R_pu = 4.7K       | g  d +5 |     | g  d +5 |
| Strong-    |      |             +-o--o--o-+     +-o--o--o-+
| Pullup   &gt; o------o               |  |  |         |  |  |
|            |      |               +--|--+         +--|--+
|            |      |               |  |            |  |
|    Data &lt;&gt; o------o---------------|--o------------|--o------ - - -
|            |                      |               |
+------------+                      V               V


I run at least three sensors this way on an approximately 6 meter bus, completely reliably.