Problems witch Session Reset on CGMiner mining on Public Pool

[mueller-s]

im facing problems with CGMiner mining on public-pool.
Problem is a regular session reset on public pool.(see below CGMiner Log).
There is no difference if i try public-pool.io or the pool i run locally.
Problem is not only on the avalon nano its also on a raspi running cgminer.
Other pools are working fine like ckpool.

{'STATUS':[{'STATUS':'S','When':0,'Code':11,'Msg':'Summary','Description':'cgminer 4.11.1'}],'SUMMARY':[{'Elapsed':2974,'MHS av':2910700.26,'MHS 5s':4720809.29,'MHS 1m':4094750.72,'MHS 5m':3410408.06,'MHS 15m':3006414.64,'Found Blocks':0,'Getworks':81,'Accepted':383,'Rejected':0,'Hardware Errors':2,'Utility':7.73,'Discarded':0,'Stale':10,'Get Failures':9,'Local Work':1162,'Remote Failures':0,'Network Blocks':3,'Total MH':8655355512.0000,'Work Utility':40662.01,'Difficulty Accepted':1955840.00000000,'Difficulty Rejected':0.00000000,'Difficulty Stale':75776.00000000,'Best Share':1379356,'Device Hardware%':0.0001,'Device Rejected%':0.0000,'Pool Rejected%':0.0000,'Pool Stale%':3.7298,'Last getwork':