lync disconnects

i have this issue with lync...see error below

Problem signature:

 Problem Event Name:                       APPCRASH

 Application Name:                            lync.exe

 Application Version:                          15.0.4623.1000

 Application Timestamp:                    5372814c

 Fault Module Name:                         ntdll.dll

 Fault Module Version:                       6.1.7601.22436

 Fault Module Timestamp:                 521eaa80

 Exception Code:                                 c0000005

 Exception Offset:                               00044522

 OS Version:                                         6.1.7601.2.1.0.256.48

 Locale ID:                                            1033

Additional information about the problem:

 LCID:                                                    1033

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