Wheel bearing Legacy hot

Hello Subarufreunde, drive a Legacy Bj. 1995 2,0 GL Automatic and have already completed about 200Tsd km with it without major repairs. My problem since a warehouse change back right about 1 year ago in a workshop (previous Subaru workshop): with fast drive over a free distance of about 20 km a light chirping and the wheel hub and rim got hot. On this track I usually do not need to brake, as it is a highway-like expressway. Excessive braking In order to exclude a possibly not completely free-running brake piston, also the brake caliper was overhauled by the workshop with a rep. set. The zirping was ready, but the wheel hub and rim continued to be hot. Since this can not remain permanent, I pushed the workshop a week ago to completely renew the wheel bearing. The work was carried out, the bearing and the 3 rings were renewed. For safety reasons, it was not possible to find any abrasion (dust and wear). also the handbrake a bit set back. Visually could not be detected at the developed camp also no damage. During my first test drive the same result as before, – hub and rim hot – !! The workshop can not find the reason and thinks that possibly camp and Simmeringe have to enter first !? – I should watch the whole thing. The left wheel hub is also warm, but not hot. Does anyone of you have advice what it might be (otherwise)? For your help bed I awoke in advance. Greeting Kammerstegel