Instability of networks: effects of sampling frequency and extreme fluctuations in financial data Jalshayin Bhachech, Arnab Chakrabarti, Taisei Kaizoji and Anindya S. Chakrabarti Eur. Phys. J. B, 95 4 (2022) 71 Published online: 25 April 2022 DOI: 10.1140/epjb/s10051-022-00332-x