Anyone can explain why I cannot mine using Claymore's Miner anymore?

Up to yesterday there was no problem with mining on my two rigs with 2 and 3 Vega 64. Both on Windows 10. Different builds ( update disabled, drivers update disabled). On one rig I had to restart the miner but after the restart that message showed up:

GPU0 - not enough GPU memory to place DAG, you cannot mine this coin with this GPU
GPU2 - not enough GPU memory to place DAG, you cannot mine this coin with this GPU
GPU1 - not enough GPU memory to place DAG, you cannot mine this coin with this GPU
GPU0 - OpenCL error -61 - cannot allocate big buffer for DAG. Check readme.txt for possible solutions.
GPU2 - OpenCL error -61 - cannot allocate big buffer for DAG. Check readme.txt for possible solutions.
GPU1 - OpenCL error -61 - cannot allocate big buffer for DAG. Check readme.txt for possible solutions.
GPU2, OpenCL error -38 - cannot write buffer for DAG
GPU1, OpenCL error -38 - cannot write buffer for DAG
GPU0, OpenCL error -38 - cannot write buffer for DAG'

In the same time on the second rig Claymore's Miner was mining without a problem. So I left that one and started to look for the problem on the first one.
After an hour of try and errors I moved to another miner (SRBminer) and there was no problem with mining.
On the second rig Claymore's Miner was still mining fine. So for the test purposes I restart this one to and it throw me the same error as on the first rig.

On both rigs I have 8GB or RAM and 64GB of swap file on SSD drive.
Claymore's Miner is started with administration rights and with:
GPU_FORCE_64BIT_PTR 0
GPU_MAX_HEAP_SIZE 100
GPU_USE_SYNC_OBJECTS 1
GPU_MAX_ALLOC_PERCENT 100
GPU_SINGLE_ALLOC_PERCENT 100

On both rigs SRBminer is running just fine.