Eth mining
After dag generation error message as given below:

Cuda error in cudaprogram.cu:206 : out of memory
Gpu: failed to initialise search buffers : out of memory
Gpu initminer error: unable to initialise cuda miner

Followed by BSOD blue screen error with Video TDR failure message Nviddmkm.sys

Please help understand the issue and troubleshooting

Nvidia gtx1070 *3 8gb cards
Gigabyte fintech b250 mobo
Windows 10 64 bit updated
Nvidia latest grd driver 466.47 (18th May 2021)
Nvidia cuda toolkit 11.3.1 updatd recently
Phoenix miner 5.6d
(additional details required?)

 
Each card works when plugged one at a time Runs correctly
Sometimes all 3 cards work toghtr but later crashes into the above mentioned error